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Measurement and Analysis of Current Noise in Chopper Amplifiers
IEEE Journal of Solid-State Circuits, 2013This paper presents a theoretical analysis and measurements of the current noise of several chopper instrumentation amplifiers, which demonstrate that the charge injection and clock feed-through associated with the MOSFETs of the input chopper give rise to significant input current and current noise.
Jiawei Xu 0001 +5 more
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Capacitively-coupled Chopper Instrumentation Amplifiers: An Overview
2018 IEEE SENSORS, 2018Capacitively-coupled chopper instrumentation amplifiers (CCIAs) have attracted plenty of attention in the past decade. They offer micro-volt offset, low 1/f noise, high noise efficiency and excellent rejection/isolation of input common-mode voltages. As such they are increasingly used in low power precision sensor interfaces, as well as in biomedical ...
Qinwen Fan, Kofi A. A. Makinwa
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The superconducting chopper amplifier-an analysis
Journal of Physics E: Scientific Instruments, 1979An analysis is given of the operation of the amplifier used for the detection of small DC voltages with a resolution of approximately 10-11-10-12 V. It is shown that the development of modulators with large normal resistances is not desirable when aiming for the ultimate insensitivity due to the large Johnson noise which is introduced.
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A fully integrated CMOS chopper amplifier
[1991] Proceedings Fourth Annual IEEE International ASIC Conference and Exhibit, 2002A CMOS chopper amplifier that achieves reduced input offset voltage and fast overload recovery time while maintaining bandwidths comparable to conventional operational amplifiers and requiring no external components is presented. The chopper amplifier consists of two folded cascode operational transconductance amplifiers (OTA) connected in a switched ...
D. Garrity, J. Young, D. Thelen
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Chopper Amplifiers Demystified Slides
2018AbstractIn CMOS amplifiers, component mismatch can easily give rise to offsets of several millivolts. However, this can be reduced to the microvolt level by the application of chopping. Compared to the alternatives, i.e. increasing device area or trimming, the use of chopping has the added advantage of also suppressing 1/f noise and drift.
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Chopper Amplifiers Demystified Transcript
2018AbstractIn CMOS amplifiers, component mismatch can easily give rise to offsets of several millivolts. However, this can be reduced to the microvolt level by the application of chopping. Compared to the alternatives, i.e. increasing device area or trimming, the use of chopping has the added advantage of also suppressing 1/f noise and drift.
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Auto Correction Feedback for Ripple Suppression in a Chopper Amplifier
IEEE Journal of Solid-State Circuits, 2009This paper proposes a local feedback, named Auto Correction Feedback (ACFB), used in a chopper amplifier to suppress its offset related ripple. It nulls out amplifier's offset in DC domain which would otherwise become modulated ripple at the chopper amplifier's output, instead of filtering the ripple by a post filter.
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On the Susceptibility of Chopper Operational Amplifiers to EMI
IEEE Transactions on Electromagnetic Compatibility, 2016This paper focuses on the susceptibility to electromagnetic interference (EMI) of chopper operational amplifiers, which are usually preferred to common ones when low-noise and low-offset features are required. The demodulation of EMI carried out by such devices is investigated analyzing the linear distortion that results from the modulation and the ...
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Capacitively-Coupled Chopper Operational Amplifiers
2016In Chap. 3, the basic capacitively-coupled chopper topology for operational amplifiers (opamp) has been described. In this chapter, two capacitively-coupled chopper opamps (CCOPA) will be presented. They both achieve wide input common-mode voltage range (CMVR) and high precision.
Qinwen Fan +2 more
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