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rfic168

Foundations of Oscillator Circuit Design

rfic168

Foundations of Oscillator Circuit Design  by Guillermo Gonzalez

Contents
Preface ix
CHAPTER 1
Theory of Oscillators 1
1.1 Introduction 1
1.2 Oscillation Conditions 1
1.3 Nyquist Stability Test 6
1.4 Root Locus 10
1.5 Routh-Hurwitz Method 18
1.6 The Wien-Bridge Oscillator 20
1.7 The Phase-Shift Oscillator 34
1.8 Active-Filter Oscillators 46
References 51
CHAPTER 2
Oscillator Characteristics 53
2.1 Introduction 53
2.2 Frequency Stability 53
2.3 Expressions for the Quality Factor 62
2.4 Noise in Oscillators 68
2.5 Oscillator Phase Noise 76
2.6 Oscillator Noise Measurements 89
2.6.1 The Direct Method 89
2.6.2 The Phase-Detector Method 89
2.6.3 The Delay-Line/Frequency-Discriminator Method 93
2.7 Statistical Design Considerations 94
References 100
CHAPTER 3
Tuned-Circuit Oscillators 103
3.1 Introduction 103
3.2 FET Tuned Oscillators 103
3.2.1 FET Pierce Oscillator 109
3.2.2 FET Colpitts Oscillator 114
3.2.3 FET Hartley Oscillator 117
v
vi Contents
3.2.4 FET Clapp Oscillator 122
3.2.5 The Grounded-Gate Oscillator 123
3.2.6 Tuned-Drain Oscillator 126
3.2.7 Cross-Coupled Tuned Oscillator 128
3.3 BJT Tuned Oscillators 130
3.3.1 BJT Pierce Oscillator 132
3.3.2 BJT Colpitts Oscillator 137
3.3.3 BJT Hartley Oscillator 142
3.3.4 The Grounded-Base Oscillator 147
3.3.5 BJT Clapp Oscillator 152
3.3.6 Tuned-Collector Oscillator 154
3.4 Op-Amp Tuned Oscillators 155
3.5 Delay-Line Oscillators 159
3.6 Voltage-Controlled Tuned Oscillators 161
3.7 Large-Signal Analysis of Oscillators 164
References 180
CHAPTER 4
Crystal Oscillators 181
4.1 Introduction 181
4.2 Crystal Characteristics 181
4.3 Frequency Pulling in a Crystal Oscillator 201
4.4 The Pierce, Colpitts, and Clapp Crystal Oscillators 208
4.5 The Grounded-Base Crystal Oscillator 230
4.6 The PI-Network Crystal Oscillator 235
4.7 Voltage-Controlled Crystal Oscillators 238
4.8 Ceramic-Resonator Oscillators 239
4.9 SAW Oscillators 242
References 250
CHAPTER 5
Negative-Resistance Oscillators 251
5.1 Introduction 251
5.2 Negative-Resistance Method 251
5.3 Oscillation Conditions—A Negative-Resistance Approach 260
5.4 Traveling-Waves and Power-Waves Concepts 266
5.4.1 S Parameters 269
5.4.2 Sp Parameters 271
5.5 Stability Considerations 272
5.6 Oscillation Conditions in Terms of Reflection Coefficients 276
5.7 Two-Port Negative-Resistance Oscillators 280
5.8 The Terminating Network 290
5.9 Oscillation-Conditions Simulations 293
5.9.1 OscTest 293
5.9.2 Nyquist Test 296
5.9.3 OscPort 297
Contents vii
5.10 Large-Signal Analysis for NROs 297
5.11 Design of Feedback Oscillators Using the Negative-Resistance
Method 302
5.12 Dielectric-Resonator Oscillators 309
5.12.1 TEM-Mode DRs 310
5.12.2 TE-Mode DRs 315
5.12.3 Parallel-Coupled DRO 340
5.13 YIG Oscillators 343
5.14 Other Negative-Resistance Devices 346
5.14.1 Gunn Diodes 346
5.14.2 Impatt Diodes 349
References 350
CHAPTER 6
Nonsinusoidal Oscillators 351
6.1 Introduction 351
6.2 Various Relaxation Oscillators 351
6.2.1 Relaxation Oscillators Using Operational Amplifiers 351
6.2.2 Relaxation Oscillators with Digital Gates 354
6.2.3 The Ring Oscillator 363
6.3 Triangular-Wave Oscillators 365
6.4 Sawtooth Oscillators 379
6.5 Oscillators Using the 555 Timer 380
6.6 ICs Function Generators 387
6.7 UJTs and PUTs 393
APPENDIX A
Conditions for a Stable Oscillation 401
APPENDIX B
Analysis of the Series Feedback Circuit 407
Selected Bibliography 413
About the Author 415
Index 417

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