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Dynamic Offset Compensated CMOS Amplifiers

:	Frerik Witte, Kofi A.A. Makinwa, Johan Huijsing
:	Dynamic Offset Compensated CMOS Amplifiers
:	Springer-Verlag
:	9789048127566
:	1
:	CHF 133.00
:

:	Elektronik, Elektrotechnik, Nachrichtentechnik
:	English

:	168
:	Wasserzeichen
:	PC/MAC/eReader/Tablet
:	PDF

Dynamic Offset-Compensated CMOS Amplifiers describe 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)

	Preface	10
	Acknowledgements	11
	1 Introduction	13
	1.1 Motivation	13
	1.2 Offset	15
	1.2.1 Drain current mismatch	16
	1.2.2 Folded cascode amplifier offset	17
	1.2.3 Minimizing offset	18
	1.3 Challenges	19
	1.4 Organisation of the book	20
	1.5 References	22
	2 Dynamic Offset Compensation Techniques	24
	2.1 Introduction	24
	2.2 Auto-zero amplifiers	25
	2.2.1 Output offset storage	25
	2.2.2 Input offset storage	27
	2.2.3 Auxiliary amplifier	28
	2.2.4 Noise in auto-zero amplifiers	30
	2.3 Chopper amplifiers	34
	2.3.1 Noise in chopper amplifiers	36
	2.3.2 Chopped operational amplifier in a feedback network	37
	2.3.3 Charge injection effects in chopper amplifiers	38
	2.4 Chopped auto-zeroed amplifier	40
	2.5 Switching non-idealities	42
	2.5.1 Charge injection reduction tactics	44
	2.5.2 Charge injection suppression circuits	47
	2.6 Conclusions	51
	2.7 References	51
	3 Dynamic Offset Compensated Operational Amplifiers	54
	3.1 Introduction	54
	3.2 Ping-pong operational amplifier	55
	3.3 Offset-stabilized amplifiers	56
	3.3.1 Auto-zero offset-stabilized amplifiers	58
	3.3.2 Chopper offset-stabilized amplifiers	59
	3.3.3 Frequency compensation	61
	3.3.4 Chopper stabilized amplifiers with ripple filters	66
	3.3.5 Chopper and auto-zero stabilized amplifiers	69
	3.4 Chopper offset-stabilized chopper amplifiers	70
	3.4.1 Iterative offset-stabilization	72
	3.5 Conclusions	74
	3.6 References	75
	4 Dynamic Offset Compensated Instrumentation Amplifiers	78
	4.1 Introduction	78
	4.1.1 Current-feedback instrumentation amplifiers	80
	4.2 Dynamic offset compensated instrumentation amplifiers	85
	4.2.1 Chopper instrumentation amplifier	86
	4.2.2 Auto-zeroed instrumentation amplifier	87
	4.2.3 Ping-pong instrumentation amplifier	89
	4.2.4 Ping-pong-pang instrumentation amplifier	89
	4.2.5 Offset-stabilized instrumentation amplifiers	90
	4.2.6 Chopper offset-stabilized chopper instrumentation amplifier	93
	4.3 Conclusions	93
	4.4 References	93
	5 Realizations of Operational Amplifiers 5	96
	5.1 Introduction	96
	5.2 Chopper offset-stabilized operational amplifier	97
	5.2.1 Topology	97
	5.2.2 Circuits	102
	5.2.3 Measurement results	109
	5.3 Chopper and auto-zero offset-stabilized operational amplifier	115
	5.3.1 Topology	115
	5.3.2 Circuits	118
	5.3.3 Measurement results	123
	5.4 Conclusions	126
	5.5 References	127
	6 Realizations of Instrumentation Amplifiers	128
	6.1 Introduction	128
	6.2 Low-offset indirect current-feedback instrumentation amplifier	129
	6.2.1 Introduction	129
	6.2.2 Topology	129
	6.2.3 Circuits	133
	6.2.4 Measurement results	135
	6.3 High-side current-sense amplifier	140
	6.3.1 Current-sensing	140
	6.3.2 Topology	144
	6.3.3 Circuits	149
	6.3.4 Measurement results	154
	6.4 Conclusions	158
	6.5 References	160
	7 Conclusions and Future Directions	162
	7.1 Conclusions	162
	7.2 Future directions	162
	A Layout Issues	166
	A.1 Introduction	166
	A.2 Chopper layout	168
	A.3 Clock shielding	171
	A.4 Conclusion	173
	A.5 References	173
	About the Authors	174
	Index	177