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Chopper Amplifier [Circuit Intuitions]
IEEE Solid-State Circuits Magazine, 2016Welcome to the ninth article in this column series. As the title suggests, each article provides insights and intuitions into circuit design and analysis. These articles are aimed at undergraduate students but may serve the interests of other readers as well.
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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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IEEE Transactions on Circuits and Systems - II - Express Briefs, 2020
In brief, a low-noise and high-linearity capacitively coupled chopper instrument amplifier (CCIA) is presented for low-power bio-sensing applications covering 0.5~500 Hz.
Quan Li, Xiaosong Wang, Yu Liu
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In brief, a low-noise and high-linearity capacitively coupled chopper instrument amplifier (CCIA) is presented for low-power bio-sensing applications covering 0.5~500 Hz.
Quan Li, Xiaosong Wang, Yu Liu
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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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IEEE Transactions on Circuits and Systems Part 1: Regular Papers
This paper presents a low-power chopper-stabilized capacitively-coupled frontend amplifier with auxiliary-path-based input impedance ( ${Z} _{\mathbf {in}}$ ) boosting. In order to achieve a high ${Z} _{\mathbf {in}}$ , a low noise and a small chip area,
Yizhao Zhou +9 more
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This paper presents a low-power chopper-stabilized capacitively-coupled frontend amplifier with auxiliary-path-based input impedance ( ${Z} _{\mathbf {in}}$ ) boosting. In order to achieve a high ${Z} _{\mathbf {in}}$ , a low noise and a small chip area,
Yizhao Zhou +9 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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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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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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IEEE Sensors Letters
This letter presents a deadtime offset reduction (DOR) technique to reduce the off-set and ripple at the output of the capacitively coupled chopper instrumentation amplifier (CCIA) for neural signal sensing.
Jihong Li +7 more
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This letter presents a deadtime offset reduction (DOR) technique to reduce the off-set and ripple at the output of the capacitively coupled chopper instrumentation amplifier (CCIA) for neural signal sensing.
Jihong Li +7 more
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