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Chopper-stabilized operational transconductance amplifiers
IEEE Transactions on Instrumentation and Measurement, 1993A technique for chopper-stabilizing commercial linearized operational transconductance amplifiers (OTAs) to remove output offset current errors is described. Design equations which illustrate performance tradeoffs as a function of component values are given. The results are verified experimentally using a common bipolar OTA. >
S.E. Nordquist +2 more
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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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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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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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Low-noise chopper amplifier design for low-frequency induction magnetometers
Journal of Geophysics and Engineering, 2023Yao Tang
exaly
A Low-Noise Chopper Amplifier with Offset and Low-Frequency Noise Compensation DC Servo Loop
Electronics (Switzerland), 2020Zhijun Zhou, Zhi-Gong Wang
exaly