Journal Article10.1109/5.542410
Circuit techniques for reducing the effects of op-amp imperfections: autozeroing, correlated double sampling, and chopper stabilization
Christian Enz,Gabor C. Temes +1 more
- 01 Nov 1996
- Vol. 84, Iss: 11, pp 1584-1614
2K
TL;DR: In this paper, some old and new circuit techniques are described for the compensation of the amplifier's most important nonideal effects including the noise (mainly thermal and 1/f noise), the input-referred dc offset voltage as well as the finite gain.
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Abstract: In linear IC's fabricated in a low-voltage CMOS technology, the reduction of the dynamic range due to the dc offset and low frequency noise of the amplifiers becomes increasingly significant. Also, the achievable amplifier gain is often quite low in such a technology, since cascoding may not be a practical circuit option due to the resulting reduction of the output signal swing. In this paper, some old and some new circuit techniques are described for the compensation of the amplifier's most important nonideal effects including the noise (mainly thermal and 1/f noise), the input-referred dc offset voltage as well as the finite gain resulting in a nonideal virtual ground at the input.
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Citations
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Design of Analog CMOS Integrated Circuits
Behzad Razavi
- 01 Jan 1999
TL;DR: The analysis and design techniques of CMOS integrated circuits that practicing engineers need to master to succeed can be found in this article, where the authors describe the thought process behind each circuit topology, but also consider the rationale behind each modification.
Hot topic: physical-layer network coding
Shengli Zhang,Soung Chang Liew,Patrick P. Lam +2 more
- 29 Sep 2006
TL;DR: This paper proposes a physical-layer network coding (PNC) scheme to coordinate transmissions among nodes that makes use of the additive nature of simultaneously arriving electromagnetic (EM) waves for equivalent coding operation and demonstrates its potential for boosting network capacity.
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A 2 $\mu\hbox{W}$ 100 nV/rtHz Chopper-Stabilized Instrumentation Amplifier for Chronic Measurement of Neural Field Potentials
Timothy J. Denison,Kelly Consoer,Wesley A. Santa,A.-T. Avestruz,J. Cooley,Andy Kelly +5 more
- 27 Nov 2007
TL;DR: The monolithic architect and micropower low-noise low-supply operation could help enable applications ranging from neuroprosthetics to seizure monitors that require a small form factor and battery operation.
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A CMOS smart temperature sensor with a 3/spl sigma/ inaccuracy of /spl plusmn/0.1/spl deg/C from -55/spl deg/C to 125/spl deg/C
Michiel A. P. Pertijs,A. Niederkorn,X. Ma,B. McKillop,A. Bakker,Johan H. Huijsing +5 more
- 05 Dec 2005
TL;DR: In this paper, a low-cost temperature sensor with on-chip sigma-delta ADC and digital bus interface was realized in a 0.5 /spl mu/m CMOS process.
A 60 $\mu$ W 60 nV/ $\surd$ Hz Readout Front-End for Portable Biopotential Acquisition Systems
TL;DR: A low-power and low-noise readout front-end with configurable characteristics for Electroencephalogram (EEG), Electrocardiogram (ECG), and Electromyogram (EMG) signals is implemented with key to its performance is the new AC-coupled chopped instrumentation amplifier.
References
An automatic offset compensation scheme with ping-pong control for CMOS operational amplifiers
Chong-Gun Yu,Randall L. Geiger +1 more
TL;DR: In this article, an automatic offset compensation scheme for CMOS operational amplifiers is presented, where offset is reduced by digitally adjusting the bias voltage of a programmable current mirror which is used as the load of the differential input stage.
Exact analysis of switched capacitor circuits with arbitrary inputs
Ming Liou,Yen-Long Kuo +1 more
TL;DR: A general formulation procedure and an exact analysis in the frequency domain for switched capacitor circuits with arbitrary inputs including cisoidal, sample-and-hold, and noise, are presented.
An Investigation of the Charge Conservation Problem for MOSFET Circuit Simulation
TL;DR: In this paper, a new charge model has been derived, implemented in SPICE2, and tested, and the new model differs from the previous models in two respects: first, it uses both charge equations and capacitance equations, and second, the partitioning of the channel charge between the source and drain terminals is carried out by requiring the charge equations to satisfy selfconsistent boundary conditions.
Offset-compensated switched-capacitor integrators
Wing-Hung Ki,Gabor C. Temes +1 more
- 01 May 1990
TL;DR: In this paper, the performance of several switched-capacitor (SC) integrators is compared and a description representation is introduced, and offset-compensated circuits which reduce the capacitance spread in very large time-constant SC integrators are presented.
A differential switched-capacitor amplifier
TL;DR: In this paper, a monolithic realization of a switched-capacitor amplifier is reported, which has op-amp offset voltage cancellation without requiring the output to slew to ground each time the amplifier is reset.