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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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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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Design and Implementation of chopper-stabilized amplifiers
2010One observation from the two neural amplifiers described in the previous two chapters is the dominance of flicker noise. Most of the existing power-noise optimization techniques target thermal noise. However, flicker noise is a significant concern for EMG/EEG/ECoG applications, where the bandwidth of interest is much lower (
Jeremy Holleman, Fan Zhang, Brian Otis
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Measurement and analysis of input current noise in chopper amplifiers
2012 Proceedings of the ESSCIRC (ESSCIRC), 2012This paper explains how the charge injection and clock feed-through of MOSFET switches causes significant input currents and current noise in chopper amplifiers. The current noise can be modeled as a form of shot noise with a white power spectral density (PSD). Both the input current and its noise PSD increase linearly with the chopping frequency. This
Jiawei Xu 0001 +5 more
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Chopper Instrumentation Amplifier Design With Fully Symmetric Loops for Input Impedance Boosting
IEEE Transactions on Circuits and Systems Part 1: Regular PapersThis paper presents a chopper instrumentation amplifier (IA) architecture with two symmetric differential negative capacitance generation feedback (NCGFB) loops. The NCGFB design technique enables to cancel parasitic capacitances of cables and electrodes
Safaa A. Abdelfattah +3 more
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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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Analysis and Design of a Ripple Reduction Chopper Bandpass Amplifier
IEEE Transactions on Circuits and Systems I: Regular Papers, 2018A low-power low-noise chopper amplifier for biosensor applications is proposed. To tackle the inherent ripple artifacts, it employs a simple ripple reduction method using a bandpass amplifier. The chopper amplifier is a linear periodic time-varying system.
Jiawei Zheng +2 more
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A 69MHz-Bandwidth 40V/μ s-Slew-Rate 3n V/√Hz-Noise 4.5 μ V-Offset Chopper Operational Amplifier
IEEE Transactions on Circuits and Systems Part 1: Regular PapersThis paper presents a chopper-stabilized three-stage operational amplifier (OpAmp) with a unity gain bandwidth of 69 MHz and an input referred noise density of 3 nV $/\surd {Hz}$ .
Y. Koolivand +6 more
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A low-power chopper bandpass amplifier for biopotential sensors
2016 IEEE International Symposium on Circuits and Systems (ISCAS), 2016A low-power low-noise chopper operational amplifier for biosensor applications is proposed. It employs a simple ripple suppression method using a band-pass amplifier. The input referred noise is only 43nV/rtHz. Fabricated in a 130nm standard CMOS process, it occupies a chip area of 0.28mm2 and consumes 33sA from a 1.2V supply.
Jiawei Zheng +2 more
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Design of CMOS Chopper Amplifiers for Thermal Sensor Interfacing
2008 Ph.D. Research in Microelectronics and Electronics, 2008An analytical approach to the design of compact CMOS chopper amplifiers for integrated thermoelectric sensors is presented. The impact of the high resistance and low signal bandwidth of thermopile sources on the design is illustrated. The proposed approach, regarding the precision vs noise tradeoff, is applied to the design of a practical prototype ...
DEI M, BRUSCHI, PAOLO, PIOTTO, MASSIMO
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