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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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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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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 Makinwa
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CMOS amplifier with Chopper Stabilization and Offset Calibration
2020 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus), 2020A high-precision CMOS amplifier architecture is presented. The proposed architecture features chopper stabilization, as well as means to calibrate its zero offset. The simulation results are confirmed by experimental measurements of silicone devices.
Yuriy Agrich +4 more
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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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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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Ultra-low noise chopper amplifier with low input charge injection
CPEM 2010, 2010A chopper amplifier is presented which achieves an ultra-low voltage noise of 0.73 nV/√Hz down to a few mHz. Excess white and 1/f current noise was observed which increases with the chopping frequency. At the lowest chopping frequency of 570 Hz, a noise level of 40 fA/√Hz with a 1/f corner at 3 mHz is obtained, corresponding to a noise temperature ...
Dietmar Drung, Jan-Hendrik Storm
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Sensitivity and noise in superconducting chopper amplifier systems
Journal of Physics E: Scientific Instruments, 1979The response of a superconducting chopper amplifier system has been calculated with a view towards optimum sensitivity. A chopper operable between 2 and 4K and with sample resistance up to 0.5 m Omega has been constructed. The best noise level (5 pV peak-to-peak for a 1 s integration time) could only be obtained with a bath of superfluid helium.
Hauschultz, M +2 more
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Reducing Switching Artifacts in Chopper Amplifiers
2018This thesis describes the theory, design, and implementation of chopper operational amplifiers (op-amps) in CMOS integrated circuits (ICs). The chopping technique periodically corrects DC errors of such op-amps, so that low 1/f noise and stable, microvolt-level offset can be achieved.
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