Main Data
Author: Frerik Witte, Kofi A.A. Makinwa, Johan Huijsing
Title: Dynamic Offset Compensated CMOS Amplifiers
Publisher: Springer-Verlag
ISBN/ISSN: 9789048127566
Edition: 1
Price: CHF 119.00
Publication date: 01/01/2009
Category: Media / Communications
Language: English
Technical Data
Pages: 168
Kopierschutz: DRM
Geräte: PC/MAC/eReader/Tablet
Formate: PDF
Table of contents

Dynamic Offset-Compensated CMOS Amplifiers describes the theory, design and realization of dynamic offset compensated CMOS amplifiers. It focuses on the design of general-purpose wide-band operational amplifiers and instrumentation amplifiers.
Two offset compensation techniques are described: auto-zeroing and chopping. Several topologies are discussed, with which these techniques can be used in the design of wide-band dynamic offset-compensated amplifiers. Four implementations are discussed in detail: two low-offset wide-band operational amplifiers, a low-offset instrumentation amplifier, and a low-offset current-sense amplifier, which can sense the current drawn from supply voltages up to 28V .

Co-author Emeritus Prof. J.H. Huijsing has (co-)authored numerous books for Springer, including the best-selling Operational Amplifiers (2000)
Table of contents
1 Introduction13
1.1 Motivation13
1.2 Offset15
1.2.1 Drain current mismatch16
1.2.2 Folded cascode amplifier offset17
1.2.3 Minimizing offset18
1.3 Challenges19
1.4 Organisation of the book20
1.5 References22
2 Dynamic Offset Compensation Techniques 24
2.1 Introduction24
2.2 Auto-zero amplifiers25
2.2.1 Output offset storage25
2.2.2 Input offset storage27
2.2.3 Auxiliary amplifier28
2.2.4 Noise in auto-zero amplifiers30
2.3 Chopper amplifiers34
2.3.1 Noise in chopper amplifiers36
2.3.2 Chopped operational amplifier in a feedback network37
2.3.3 Charge injection effects in chopper amplifiers38
2.4 Chopped auto-zeroed amplifier40
2.5 Switching non-idealities42
2.5.1 Charge injection reduction tactics44
2.5.2 Charge injection suppression circuits47
2.6 Conclusions51
2.7 References51
3 Dynamic Offset Compensated Operational Amplifiers54
3.1 Introduction54
3.2 Ping-pong operational amplifier55
3.3 Offset-stabilized amplifiers56
3.3.1 Auto-zero offset-stabilized amplifiers58
3.3.2 Chopper offset-stabilized amplifiers59
3.3.3 Frequency compensation61
3.3.4 Chopper stabilized amplifiers with ripple filters66
3.3.5 Chopper and auto-zero stabilized amplifiers69
3.4 Chopper offset-stabilized chopper amplifiers70
3.4.1 Iterative offset-stabilization72
3.5 Conclusions74
3.6 References75
4 Dynamic Offset Compensated Instrumentation Amplifiers78
4.1 Introduction78
4.1.1 Current-feedback instrumentation amplifiers80
4.2 Dynamic offset compensated instrumentation amplifiers85
4.2.1 Chopper instrumentation amplifier86
4.2.2 Auto-zeroed instrumentation amplifier87
4.2.3 Ping-pong instrumentation amplifier89
4.2.4 Ping-pong-pang instrumentation amplifier89
4.2.5 Offset-stabilized instrumentation amplifiers90
4.2.6 Chopper offset-stabilized chopper instrumentation amplifier93
4.3 Conclusions93
4.4 References93
5 Realizations of Operational Amplifiers 596
5.1 Introduction96
5.2 Chopper offset-stabilized operational amplifier97
5.2.1 Topology97
5.2.2 Circuits102
5.2.3 Measurement results109
5.3 Chopper and auto-zero offset-stabilized operational amplifier115
5.3.1 Topology115
5.3.2 Circuits118
5.3.3 Measurement results123
5.4 Conclusions126
5.5 References127
6 Realizations of Instrumentation Amplifiers128
6.1 Introduction128
6.2 Low-offset indirect current-feedback instrumentation amplifier129
6.2.1 Introduction129
6.2.2 Topology129
6.2.3 Circuits133
6.2.4 Measurement results135
6.3 High-side current-sense amplifier140
6.3.1 Current-sensing140
6.3.2 Topology144
6.3.3 Circuits149
6.3.4 Measurement results154
6.4 Conclusions 158
6.5 References160
7 Conclusions and Future Directions162
7.1 Conclusions162
7.2 Future directions162
A Layout Issues166
A.1 Introduction166
A.2 Chopper layout168
A.3 Clock shielding171
A.4 Conclusion173
A.5 References173
About the Authors174