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 是ADI公司出的,里面讲了各种类型AD(sigma delta, flash,successive, pipeline 等),DA(current steering,sigma delta等)
 的原理已经注意事项。是一本很好的参考书。
 Contents
 Foreword .......................................................................................................................... xvii
 Preface ..............................................................................................................................xix
 Acknowledgments ...............................................................................................................xxi
 Chapter 1: Data Converter History ........................................................................................3
 Section 1-1: Early History .............................................................................................................5
 The Early Years: Telegraph to Telephone .......................................................................................... 6
 The Invention of PCM ....................................................................................................................... 8
 The Mathematical Foundations of PCM ........................................................................................... 9
 The PCM Patents of Alec Harley Reeves ........................................................................................ 10
 PCM and the Bell System: World War II through 1948 .................................................................. 11
 Op Amps and Regenerative Repeaters: Vacuum Tubes to Solid-State ............................................ 13
 Section 1-2: Data Converters of the 1950s and 1960s ...................................................................19
 Commercial Data Converters: 1950s ............................................................................................... 19
 Commercial Data Converter History: 1960s ................................................................................... 20
 Data Converter Architectures .......................................................................................................... 23
 Section 1-3: Data Converters of the 1970s ...................................................................................27
 Monolithic Data Converters of the 1970s ........................................................................................ 28
 Bipolar Process IC DACs of the 1970s ........................................................................................... 28
 CMOS IC DACs of the 1970s ......................................................................................................... 29
 Monolithic ADCs of the 1970s ........................................................................................................ 31
 Hybrid Data Converters of the 1970s .............................................................................................. 32
 Modular Data Converters of the 1970s ............................................................................................ 35
 Section 1-4: Data Converters of the 1980s ...................................................................................39
 Monolithic DACs of the 1980s ........................................................................................................ 40
 Monolithic ADCs of the 1980s ........................................................................................................ 41
 Monolithic Flash ADCs of the 1980s .............................................................................................. 42
 Hybrid and Modular DACs and ADCs of the 1980s ....................................................................... 42
 Section 1-5: Data Converters of the 1990s ...................................................................................45
 Monolithic DACs of the 1990s ........................................................................................................ 46
 Monolithic ADCs of the 1990s ........................................................................................................ 48
 Hybrid and Modular DACs and ADCs of the 1990s ....................................................................... 52
 Section 1-6: Data Converters of the 2000s ...................................................................................53
 Chapter 2: Fundamentals of Sampled Data Systems ...............................................................57
 Section 2-1: Coding and Quantizing .............................................................................................57
 Unipolar Codes ............................................................................................................................... 59
 Gray Code ....................................................................................................................................... 61
 Bipolar Codes ................................................................................................................................. 62
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 vi
 Contents
 Complementary Codes .................................................................................................................... 65
 DAC and ADC Static Transfer Functions and DC Errors ............................................................... 66
 Section 2-2: Sampling Theory ......................................................................................................73
 The Need for a Sample-and-Hold Amplifi er (SHA) Function ........................................................ 74
 The Nyquist Criteria ........................................................................................................................ 76
 Baseband Antialiasing Filters .......................................................................................................... 78
 Undersampling (Harmonic Sampling, Bandpass Sampling, IF Sampling,
 Direct IF-to-Digital Conversion) ................................................................................................. 80
 Antialiasing Filters in Undersampling Applications ....................................................................... 81
 Section 2-3: Data Converter AC Errors ........................................................................................83
 Theoretical Quantization Noise of an Ideal N-Bit Converter .......................................................... 83
 Noise in Practical ADCs .................................................................................................................. 88
 Equivalent Input Referred Noise .................................................................................................... 89
 Noise-Free (Flicker-Free) Code Resolution ................................................................................... 89
 Dynamic Performance of Data Converters ...................................................................................... 90
 Integral and Differential Nonlinearity Distortion Effects ................................................................ 90
 Harmonic Distortion, Worst Harmonic, Total Harmonic Distortion (THD),
 Total Harmonic Distortion Plus Noise (THD + N) ...................................................................... 91
 Signal-to-Noise-and-Distortion Ratio (SINAD), Signal-to-Noise Ratio (SNR),
 and Effective Number of Bits (ENOB) ....................................................................................... 91
 Analog Bandwidth ........................................................................................................................... 92
 Spurious Free Dynamic Range (SFDR) .......................................................................................... 93
 Two-Tone Intermodulation Distortion (IMD) ................................................................................. 94
 Second- and Third-Order Intercept Points, 1 dB Compression Point ............................................. 95
 Multitone Spurious Free Dynamic Range ....................................................................................... 96
 Wideband CDMA (WCDMA) Adjacent Channel Power Ratio (ACPR) and Adjacent
 Channel Leakage Ratio (ADLR) ................................................................................................. 97
 Noise Power Ratio (NPR) ................................................................................................................ 98
 Noise Factor (F) and Noise Figure (NF) ....................................................................................... 100
 Aperture Time, Aperture Delay Time, and Aperture Jitter ........................................................... 106
 A Simple Equation for the Total SNR of an ADC ........................................................................ 108
 ADC Transient Response and Overvoltage Recovery ................................................................... 109
 ADC Sparkle Codes, Metastable States, and Bit Error Rate (BER) ............................................. 111
 DAC Dynamic Performance ......................................................................................................... 115
 DAC Settling Time ................................................................................................................. 115
 Glitch Impulse Area ............................................................................................................... 116
 DAC SFDR and SNR ............................................................................................................. 117
 Measuring DAC SNR with an Analog Spectrum Analyzer .................................................... 118
 DAC Output Spectrum and sin (x)/x Frequency Roll-off ....................................................... 119
 Oversampling Interpolating DACs ......................................................................................... 120
 Section 2-4: General Data Converter Specifi cations ......................................................................123
 Overall Considerations .................................................................................................................. 123
 Logic Interface Issues .................................................................................................................... 124
 Data Converter Logic: Timing and other Issues ............................................................................ 125
 Section 2-5: Defi ning the Specifi cations .......................................................................................127
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 vii
 Contents
 Chapter 3: Data Converter Architectures ............................................................................147
 Section 3-1: DAC Architectures .................................................................................................147
 DAC Output Considerations .......................................................................................................... 148
 Basic DAC Structures .................................................................................................................... 149
 The Kelvin Divider (String DAC) .......................................................................................... 149
 Thermometer (Fully-Decoded) DACs .................................................................................... 151
 Binary-Weighted DACs .......................................................................................................... 153
 R-2R DACs ............................................................................................................................. 155
 Segmented DACs .................................................................................................................... 159
 Oversampling Interpolating DACs ................................................................................................ 163
 Multiplying DACs ......................................................................................................................... 164
 Intentionally Nonlinear DACs ....................................................................................................... 164
 Counting, Pulsewidth-Modulated (PWM) DACs .......................................................................... 167
 Cyclic Serial DACs ........................................................................................................................ 167
 Other Low Distortion Architectures .............................................................................................. 169
 DAC Logic Considerations ............................................................................................................ 170
 Section 3-2: ADC Architectures .................................................................................................175
 The Comparator: A 1-Bit ADC ...................................................................................................... 178
 High Speed ADC Architectures ..................................................................................................... 180
 Flash Converters ..................................................................................................................... 180
 Successive Approximation ADCs ........................................................................................... 185
 Subranging, Error Corrected, and Pipelined ADCs ............................................................... 190
 Serial Bit-Per-Stage Binary and Gray Coded (Folding) ADCs ............................................. 203
 Counting and Integrating ADC Architectures ............................................................................... 211
 A. H. Reeves’ 5-Bit Counting ADC ....................................................................................... 211
 Charge Run-Down ADC ......................................................................................................... 212
 Ramp Run-Up ADC ............................................................................................................... 212
 Tracking ADC ........................................................................................................................ 213
 Voltage-to-Frequency Converters (VFCs) .............................................................................. 214
 Dual Slope/Multislope ADCs ................................................................................................. 218
 Optical Converters ......................................................................................................................... 220
 Resolver-to-Digital Converters (RDCs) and Synchros .................................................................. 221
 Section 3-3: Sigma-Delta Converters ..........................................................................................231
 Historical Perspective .................................................................................................................... 231
 Sigma-Delta (Σ-Δ) or Delta-Sigma (Δ-Σ)? ................................................................................... 234
 Basics of Sigma-Delta ADCs ........................................................................................................ 235
 Idle Tone Considerations ............................................................................................................... 240
 Higher Order Loop Considerations ............................................................................................... 241
 Multibit Sigma-Delta Converters .................................................................................................. 242
 Digital Filter Implications ............................................................................................................. 243
 Multistage Noise Shaping (MASH) Sigma-Delta Converters ....................................................... 244
 High Resolution Measurement Sigma-Delta ADCs ...................................................................... 245
 Sigma-Delta DACs ........................................................................................................................ 249
 Chapter 4: Data Converter Process Technology ....................................................................257
 Section 4-1: Early Processes ......................................................................................................257
 Vacuum Tube Data Converters ...................................................................................................... 257
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 viii
 Contents
 Solid State, Modular, and Hybrid Data Converters ....................................................................... 259
 Calibration Processes ..................................................................................................................... 262
 Section 4-2: Modern Processes ...................................................................................................265
 Bipolar Processes ........................................................................................................................... 265
 Thin Film Resistor Processes ........................................................................................................ 265
 Complementary Bipolar (CB) Processes ....................................................................................... 266
 CMOS Processes ........................................................................................................................... 266
 Data Converter Processes and Architectures ................................................................................. 268
 Section 4-3: Smart Partitioning .................................................................................................273
 When Complete Integration Isn’t the Optimal Solution ................................................................ 273
 Why Smart Partitioning is Necessary ........................................................................................... 276
 What’s Changing? ......................................................................................................................... 277
 Chapter 5: Testing Data Converters ...................................................................................283
 Section 5-1: Testing DACs ........................................................................................................283
 Static DAC Testing ........................................................................................................................ 283
 End-Point Errors ..................................................................................................................... 284
 Linearity Errors ...................................................................................................................... 286
 Superposition and DAC Errors ............................................................................................... 286
 Measuring DAC DNL and INL Using Superposition ............................................................ 287
 Measuring DAC INL and DNL Where Superposition Does Not Hold .................................. 290
 Testing DACs for Dynamic Performance ...................................................................................... 292
 Settling Time .......................................................................................................................... 292
 Glitch Impulse Area ............................................................................................................... 293
 Oscilloscope Measurement of Settling Time and Glitch Impulse Area ................................ 294
 Distortion Measurements ....................................................................................................... 295
 Section 5-2: Testing ADCs ........................................................................................................303
 A Brief Historical Overview of Data Converter Specifi cations and Testing ................................. 303
 Static ADC Testing ........................................................................................................................ 304
 Back-to-Back Static ADC Testing .......................................................................................... 306
 Crossplot Measurements of ADC Linearity ........................................................................... 309
 Servo-Loop Code Transition Test ........................................................................................... 310
 Computer-Based Servo-Loop ADC Tester ............................................................................. 311
 Histogram (Code Density) Test with Linear Ramp Input ...................................................... 312
 Dynamic ADC Testing ................................................................................................................... 317
 Manual “Back-to-Back” Dynamic ADC Testing ................................................................... 317
 Measuring Effective Number of Bits (ENOB) Using Sinewave Curve Fitting ...................... 320
 FFT Basics .............................................................................................................................. 322
 FFT Test Setup Confi guration and Measurements ................................................................. 329
 Verifying the FFT Accuracy ................................................................................................... 335
 Generating Low Distortion Sinewave Inputs ......................................................................... 335
 Noise Power Ratio (NPR) Testing .......................................................................................... 337
 Measuring ADC Aperture Jitter Using the Locked-Histogram Test Method ......................... 338
 Measuring Aperture Delay Time ............................................................................................ 340
 Measuring ADC Aperture Jitter Using FFTs .......................................................................... 340
 Measuring ADC Analog Bandwidth Using FFTs .................................................................. 342
 Settling Time .......................................................................................................................... 343
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 ix
 Contents
 Overvoltage Recovery Time ................................................................................................... 344
 Video Testing, Differential Gain and Differential Phase ........................................................ 344
 Bit Error Rate (BER) Tests ..................................................................................................... 348
 Chapter 6: Interfacing to Data Converters ...........................................................................359
 Section 6-1: Driving ADC Analog Inputs .....................................................................................359
 Amplifer DC and AC Performance Considerations ...................................................................... 361
 Rail-Rail Input Stages .................................................................................................................... 362
 Output Stages ................................................................................................................................ 365
 Gain and Level-Shifting Circuits Using Op Amps ........................................................................ 367
 Op Amp AC Specifi cations and Data Converter Requirements .................................................... 369
 Driving High Resolution Σ-Δ Measurement ADCs ....................................................................... 371
 Driving Single-Ended Input Single-Supply 1.6 V to 3.6 V Successive Approximation ADCs ..... 372
 Driving Single-Supply ADCs with Scaled Inputs ......................................................................... 373
 Driving Differential Input CMOS Switched Capacitor ADCs ...................................................... 374
 Single-Ended Drive Circuits for Differential Input CMOS ADCs ................................................ 376
 Differential Input ADC Drivers ..................................................................................................... 378
 Driving ADCs with Differential Amplifi ers .................................................................................. 382
 Dual Op Amp Drivers .................................................................................................................... 383
 Fully Integrated Differential Amplifi er Drivers ............................................................................. 384
 Driving Differential Input ADCs with Integrated Differential Drivers ......................................... 387
 Section 6-2: ADC and DAC Digital Interfaces(and Related Issues) ................................................397
 Power-On Initialization of Data Converters ................................................................................. 397
 Initialization of Data Converter Internal Control Registers ........................................................... 398
 Low Power, Sleep, and Standby Modes ....................................................................................... 398
 Single-Shot Mode, Burst Mode, and Minimum Sampling Frequency .......................................... 399
 ADC Digital Output Interfaces ...................................................................................................... 400
 ADC Serial Output Interfaces ....................................................................................................... 400
 ADC Serial Interface to DSPs ...................................................................................................... 403
 ADC Parallel Output Interfaces ..................................................................................................... 405
 DAC Digital Input Interfaces ......................................................................................................... 408
 DAC Serial Input Interfaces to DSPs ............................................................................................ 410
 DAC Parallel Input Interfaces to DSPs .......................................................................................... 411
 Section 6-3: Buffering DAC Analog Outputs ...............................................................................415
 Differential to Single-Ended Conversion Techniques ................................................................... 416
 Single-Ended Current-to-Voltage Conversion ............................................................................... 418
 Differential Current-to-Differential Voltage Conversion ............................................................... 420
 An Active Low-Pass Filter for Audio DAC .................................................................................. 420
 Section 6-4: Data Converter Voltage References ..........................................................................423
 Section 6-5: Sampling Clock Generation .....................................................................................427
 Oscillator Phase Noise and Jitter ................................................................................................... 430
 “Hybrid” Clock Generators ........................................................................................................... 437
 Driving Differential Sampling Clock Inputs ................................................................................. 438
 Sampling Clock Summary ............................................................................................................. 439
 Chapter 7: Data Converter Support Circuits ........................................................................443
 Section 7-1: Voltage References .................................................................................................443
 Precision Voltage References ........................................................................................................ 443
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 Contents
 Types of Voltage References .......................................................................................................... 444
 Bandgap References ............................................................................................................... 446
 Buried Zener References ........................................................................................................ 451
 XFET References ................................................................................................................... 452
 Voltage Reference Specifi cations .................................................................................................. 455
 Tolerance ............................................................................................................................... 455
 Drift ....................................................................................................................................... 455
 Supply Range ......................................................................................................................... 456
 Load Sensitivity ...................................................................................................................... 456
 Line Sensitivity ....................................................................................................................... 457
 Noise ...................................................................................................................................... 457
 Scaled References .......................................................................................................................... 459
 Voltage Reference Pulse Current Response ................................................................................... 460
 Low Noise References for High Resolution Converters ............................................................... 462
 Section 7-2: Low Dropout Linear Regulators ...............................................................................465
 Linear Voltage Regulator Basics .................................................................................................... 465
 Pass Devices and their Associated Trade Offs ............................................................................... 468
 Low Dropout Regulator Architectures .......................................................................................... 472
 The anyCAP Low Dropout Regulator Family ............................................................................... 475
 Design Features Related to DC Performance ......................................................................... 475
 Design Features Related to AC Performance ......................................................................... 476
 A Basic Pole-Splitting Topology ............................................................................................ 477
 The anyCAP Pole-Splitting Topology .................................................................................... 477
 The anyCAP LDO series devices ........................................................................................... 478
 Functional Diagram and Basic 50 mA LDO Regulator ......................................................... 479
 LDO Regulator Thermal Considerations ............................................................................... 481
 LDO Regulator Controllers ........................................................................................................... 485
 Regulator Controller Differences ........................................................................................... 485
 A Basic 5 V/1 A LDO Regulator Controller .......................................................................... 486
 Selecting the Pass Device ....................................................................................................... 487
 Thermal Design ...................................................................................................................... 488
 Sensing Resistors for LDO Controllers .................................................................................. 489
 PCB Layout Issues ................................................................................................................. 490
 A 2.8 V/8 A LDO Regulator Controller ................................................................................. 491
 Section 7-3: Analog Switches and Multiplexers ............................................................................493
 CMOS Switch Basics .................................................................................................................... 494
 Error Sources in the CMOS Switch ............................................................................................... 496
 Applying the Analog Switch ........................................................................................................ 504
 1 GHz CMOS Switches ................................................................................................................. 508
 Video Switches and Multiplexers .................................................................................................. 508
 Video Crosspoint Switches ............................................................................................................ 511
 Digital Crosspoint Switches .......................................................................................................... 512
 Switch and Multiplexer Families from Analog Devices ................................................................ 512
 Parasitic Latchup in CMOS Switches and Muxes ......................................................................... 512
 Section 7-4: Sample-and-Hold Circuits ........................................................................................519
 Introduction and Historical Perspective ........................................................................................ 519
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 xi
 Contents
 Basic SHA Operation .................................................................................................................... 521
 Track Mode Specifi cations ............................................................................................................ 522
 Track-to-Hold Mode Specifi cations .............................................................................................. 522
 Hold Mode Specifi cations ............................................................................................................. 526
 Hold-to-Track Transition Specifi cations ....................................................................................... 528
 SHA Architectures ......................................................................................................................... 529
 Internal SHA Circuits for IC ADCs ............................................................................................... 531
 SHA Applications .......................................................................................................................... 533
 Chapter 8: Data Converter Applications .............................................................................539
 Section 8-1: Precision Measurement and Sensor Conditioning ........................................................539
 Applications of Precision Measurement Σ-Δ ADCs ...................................................................... 540
 Weigh Scale Design Analysis Using the AD7730 ADC ................................................................ 544
 Thermocouple Conditioning Using the AD7793 ........................................................................... 549
 Direct Digital Temperature Measurements .................................................................................... 551
 Microprocessor Substrate Temperature Sensors ............................................................................ 555
 Applications of ADCs in Power Meters ........................................................................................ 558
 Section 8-2: Multichannel Data Acquisition Systems .....................................................................563
 Data Acquisition System Confi gurations ....................................................................................... 563
 Multiplexing ................................................................................................................................. 564
 Filtering Considerations in Data Acquisition Systems .................................................................. 567
 Complete Data Acquisition Systems on a Chip ............................................................................. 568
 Multiplexing Inputs to Σ-Δ ADCs ................................................................................................. 570
 Simultaneous Sampling Systems ................................................................................................... 572
 Data Distribution Systems ............................................................................................................ 574
 Data Distribution Using an Infi nite Sample-and-Hold .................................................................. 578
 Section 8-3: Digital Potentiometers ............................................................................................581
 Modern Digital Potentiometers in Tiny Packages ......................................................................... 582
 Digital Potentiometers with Nonvolatile Memory ........................................................................ 584
 One-Time Programmable (OTP) Digital Potentiometers .............................................................. 585
 Digital Potentiometer AC Considerations ..................................................................................... 586
 Application Examples ................................................................................................................... 587
 Section 8-4: Digital Audio .........................................................................................................591
 Sampling Rate and THD + N Requirements for Digital Audio ..................................................... 592
 Overall Trends in Digital Audio ADCs and DACs ........................................................................ 595
 Voiceband Codecs .......................................................................................................................... 596
 High Performance Audio ADCs and DACs in Separate Packages ................................................ 597
 High Performance Multichannel Audio Codecs and DACs .......................................................... 600
 Sample Rate Converters ................................................................................................................ 602
 Section 8-5: Digital Video and Display Electronics .......................................................................607
 Digital Video ................................................................................................................................. 607
 Digital Video Formats ............................................................................................................ 608
 Serial Data Interfaces ............................................................................................................. 612
 Digital Video ADCs and DACs: Decoders, and Encoders ..................................................... 612
 Specifi cations for Video Decoders and Encoders ................................................................... 614
 Display Electronics ........................................................................................................................ 615
 Flat Panel Display Electronics ............................................................................................... 619
 TLFeBOOK
 xiii
 Contents
 Section 9-2: PC Board Design Issues ..........................................................................................733
 Resistance of Conductors .............................................................................................................. 733
 Voltage Drop in Signal Leads—“Kelvin” Feedback ..................................................................... 735
 Signal Return Currents .................................................................................................................. 736
 Grounding in Mixed Analog/Digital Systems ............................................................................... 737
 Ground and Power Planes ...................................................................................................... 738
 Double-Sided versus Multilayer Printed Circuit Boards ........................................................ 739
 Multicard Mixed-Signal Systems ........................................................................................... 740
 Separating Analog and Digital Grounds ................................................................................. 740
 Grounding and Decoupling Mixed-Signal ICs with Low Digital Currents ........................... 742
 Treat the ADC Digital Outputs with Care .............................................................................. 743
 Sampling Clock Considerations ............................................................................................. 744
 The Origins of the Confusion about Mixed-Signal Grounding: Applying Single-Card
 Grounding Concepts to Multicard Systems ...................................................................... 746
 Summary: Grounding Mixed-Signal Devices with Low Digital Currents in a
 Multicard System ............................................................................................................... 747
 Summary: Grounding Mixed-Signal Devices with High Digital Currents in a
 Multicard System ............................................................................................................... 748
 Grounding DSPs with Internal Phase-Locked Loops ............................................................. 748
 Grounding Summary .............................................................................................................. 749
 Some General PC Board Layout Guidelines for Mixed-Signal Systems ...................................... 750
 Skin Effect .............................................................................................................................. 751
 Transmission Lines ................................................................................................................. 753
 Be Careful With Ground Plane Breaks ................................................................................... 753
 Ground Isolation Techniques .................................................................................................. 754
 Static PCB Effects .................................................................................................................. 756
 Sample MINIDIP and SOIC Op Amp PCB Guard Layouts .................................................. 758
 Dynamic PCB Effects ............................................................................................................ 760
 Stray Capacitance ................................................................................................................... 761
 Capacitive Noise and Faraday Shields ................................................................................... 762
 The Floating Shield Problem .................................................................................................. 762
 Buffering ADCs Against Logic Noise ................................................................................... 763
 Section 9-3: Analog Power Supply Systems ..................................................................................767
 Linear IC Regulation ..................................................................................................................... 768
 Some Linear Voltage Regulator Basics .................................................................................. 768
 Pass Devices .......................................................................................................................... 770
 ±15 V Regulator Using Adjustable Voltage ICs ..................................................................... 770
 Low Dropout Regulator Architectures ................................................................................... 771
 Fixed-Voltage, 50/100/200/500/1000/1500 mA LDO Regulators ......................................... 772
 Adjustable Voltage, 200 mA LDO Regulator ......................................................................... 774
 Charge-Pump Voltage Converters ................................................................................................. 775
 Regulated Output Charge-Pump Voltage Converters .................................................................... 776
 Linear Post Regulator for Switching Supplies .............................................................................. 778
 Grounding Linear and Switching Regulators ................................................................................ 779
 Power Supply Noise Reduction and Filtering ............................................................................... 782
 Capacitors ............................................................................................................................... 782
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 xiv
 Contents
 Ferrites ................................................................................................................................... 786
 Card Entry Filter ..................................................................................................................... 787
 Rail Bypass/Distribution Filter ............................................................................................... 788
 Local High Frequency Bypass/Decoupling ............................................................................ 789
 Section 9-4: Overvoltage Protection ...........................................................................................793
 In-Circuit Overvoltage Protection ................................................................................................. 793
 General Input Common Mode Limitations ................................................................................... 793
 Clamping Diode Leakage .............................................................................................................. 795
 A Flexible Voltage Follower Protection Circuit ........................................................................... 796
 Common-Mode Overvoltage Protection Using CMOS Channel Protectors ................................. 797
 CM Overvoltage Protection Using High CM Voltage In Amp ...................................................... 798
 Inverting Mode Op Amp Protection Schemes ............................................................................... 800
 Amplifi er Output Voltage Phase-Reversal ..................................................................................... 800
 An Output Phase-Reversal Do-it-Yourself Test ...................................................................... 802
 Fixes for Output Phase–Reversal ........................................................................................... 802
 Input Differential Protection ......................................................................................................... 803
 Protecting In Amps Against Overvoltage ...................................................................................... 804
 Overvoltage Protection Using CMOS Channel Protectors ............................................................ 808
 Digital Isolators ............................................................................................................................. 810
 Out-of-Circuit Overvoltage Protection .......................................................................................... 813
 ESD Models and Testing ............................................................................................................... 817
 Section 9-5: Thermal Management .............................................................................................823
 Thermal Basics .............................................................................................................................. 823
 Heat Sinking ................................................................................................................................. 825
 Data Converter Thermal Considerations ....................................................................................... 829
 Section 9-6: EMI/RFI Considerations .........................................................................................833
 EMI/RFI Mechanisms ................................................................................................................... 834
 EMI Noise Sources ........................................................................................................................ 834
 EMI Coupling Paths ...................................................................................................................... 834
 Noise Coupling Mechanisms ......................................................................................................... 834
 Reducing Common-Impedance Noise ........................................................................................... 835
 Noise Induced by Near-Field Interference .................................................................................... 836
 Reducing Capacitance-Coupled Noise .......................................................................................... 836
 Reducing Magnetically-Coupled Noise ........................................................................................ 837
 Passive Components: Your Arsenal Against EMI .......................................................................... 838
 Reducing System Susceptibility to EMI ........................................................................................ 839
 A Review of Shielding Concepts ................................................................................................... 839
 General Points on Cables and Shields ........................................................................................... 842
 Input-Stage RFI Rectifi cation Sensitivity ...................................................................................... 846
 Background: Op Amp and In Amp RFI Rectifi cation Sensitivity Tests ................................. 846
 An Analytical Approach: BJT RFI Rectifi cation .................................................................... 847
 An Analytical Approach: FET RFI Rectifi cation .................................................................. 848
 Reducing RFI Rectifi cation Within Op amp and In Amp Circuits ......................................... 849
 Op Amp Inputs ............................................................................................................................. 849
 In Amp Inputs ............................................................................................................................... 850
 Amplifi er Outputs and EMI/RFI ................................................................................................... 852
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 xv
 Contents
 Printed Circuit Board Design for EMI/RFI Protection .................................................................. 852
 Choose Logic Devices Carefully .................................................................................................. 853
 Design PCBs Thoughtfully ............................................................................................................ 853
 Designing Controlled Impedances Traces on PCBs ..................................................................... 854
 Microstrip PCB Transmission Lines ............................................................................................. 855
 Some Microstrip Guidelines .......................................................................................................... 855
 Symmetric Stripline PCB Transmission Lines .............................................................................. 856
 Some Pros and Cons of Embedding Traces ................................................................................... 857
 Dealing with High-Speed Logic .................................................................................................... 858
 Section 9-7: Low Voltage Logic Interfacing ..................................................................................867
 Voltage Tolerance and Voltage Compliance .................................................................................. 870
 Interfacing 5 V Systems to 3.3 V Systems using NMOS FET “Bus Switches” ............................ 871
 3.3 V/2.5 V Interfaces .................................................................................................................... 873
 3.3 V/2.5 V, 3.3 V/1.8 V, 2.5 V/1.8 V Interfaces ............................................................................ 874
 Hot Swap and Hot Plug Applications of Bus Switches ................................................................. 878
 Internally Created Voltage Tolerance / Compliance ...................................................................... 879
 Section 9-8: Breadboarding and Prototyping ...............................................................................881
 “Deadbug” Prototyping ................................................................................................................. 882
 Solder-Mount Prototyping ............................................................................................................. 884
 Milled PCB Prototyping ................................................................................................................ 885
 Beware of Sockets ......................................................................................................................... 886
 Some Additional Prototyping Points ............................................................................................. 887
 Evaluation Boards .......................................................................................................................... 887
 General-Purpose Op Amp Evaluation Board from the Mid-1990s ........................................ 888
 Dedicated Op Amp Evaluation Boards .................................................................................. 888
 Data Converter Evaluation Boards ......................................................................................... 890
 Index ...............................................................................................................................895
 TLFeBOOK
 
 
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