High Frequency and High Dynamic Range Continuous Time Filters

fhchen2002

Ph.D. Dissertation
Title: High Frequency and High Dynamic Range Continuous Time Filters
Author: Artur Juliusz Lewinski Komincz
Texas A&M University
Thesis advisor: Jose Silva Martinez (此人是 CMOS Continuous-time filter 的大牛人)

TABLE OF CONTENTS                                                                                                    Page
1. INTRODUCTION.......................................................................................................... 1
1.1 The need of analog filters......................................................................................... 1
1.2 Challenges in continuous-time filters....................................................................... 5
1.3 State of the art in continuous time filters ............................................................... 10
1.4 Contributions.......................................................................................................... 12
1.5 Organization ........................................................................................................... 14
2. LINEARITY ENHANCEMENT TECHNIQUES BASED ON NONLINEARITY
CANCELLATION..................................................................... 15
2.1 The differential pair................................................................................................ 15
2.1.1 Distortion......................................................................................................... 16
2.1.2 Noise................................................................................................................ 23
2.2 The double differential pair.................................................................................... 26
2.2.1 Analysis ........................................................................................................... 26
2.2.2 Improvement comparison................................................................................ 31
2.3 A 20 MHz second order low-pass filter ................................................................. 35
2.3.1 OTA design ..................................................................................................... 35
2.3.2 Filter design..................................................................................................... 39
2.3.3 Experimental results ........................................................................................ 41
2.4 The triple differential pair ...................................................................................... 47
2.4.1 Analysis ........................................................................................................... 47
2.4.2 Advantages of the topology............................................................................. 52
2.4.3 Complete OTA ................................................................................................ 55
2.4.4 Experimental results ........................................................................................ 56
2.4.5 Comparison with reported OTAs .................................................................... 59
3. LINEARITY TECHNIQUES BASED ON NON-LINEAR SOURCE DEGENERATION........................................................................................... 61
3.1 Non-linear degeneration principle.......................................................................... 61
3.2 A 30-MHz low-pass filter implementation ............................................................ 74
3.2.1 Design considerations ..................................................................................... 74
3.2.2 Filter structure. ................................................................................................ 78
3.2.3 Transconductors .............................................................................................. 80
3.2.4 Common mode feedback................................................................................. 86
3.2.5 Self-bias circuit ............................................................................................... 87
3.2.6 Capacitors........................................................................................................ 90
3.3 Automatic tuning.................................................................................................... 94
3.3.1 Master circuit................................................................................................... 97
3.3.1 Analog section................................................................................................. 99
3.3.2 Digital tuning circuit ..................................................................................... 103
3.3.3 Non-idealities ................................................................................................ 104
3.3.3.1 Jitter and mismatch (offset).................................................................... 105
3.3.3.2 Output resistance .................................................................................... 105
3.3.3.3 Parasitic capacitances ............................................................................. 107
3.3.4 Overall accuracy............................................................................................ 108
3.4 Experimental results ............................................................................................. 110
3.4.1 Frequency response ....................................................................................... 112
3.4.2 Linearity ........................................................................................................ 113
3.5. Comparison with state of the art solutions .......................................................... 118
4. CONCLUSION.......................................................................................................... 121
REFERENCES............................................................................................................... 123

Format: PDF
Size of the document: 1.19 MB

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