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A Chopper Instrumentation Amplifier with Amplifier Slicing Technique for Offset Reduction
2020 IEEE International Symposium on Circuits and Systems (ISCAS), 2020This paper presents a chopper instrumentation amplifier design that employs a proposed amplifier slicing technique for offset reduction. In this scheme, the core amplifier is split into multiple identical slices. During operation, the offset polarity of these slices is firstly determined by employing the second-stage of the amplifier as a static ...
Tsz Ngai Lin +3 more
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A fully differential capacitively-coupled high CMRR low-power chopper amplifier for EEG dry electrodes [PDF]
Analog Integrated Circuits and Signal Processing, 2020 The use of dry electrodes is increasing rapidly. Since their impedance is high, there is a high impedance node at the connecting node between the electrode and amplifier.
Trond Ytterdal +1 more
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A sensitive superconducting “chopper” amplifier
Physica, 1957Synopsis A superconducting “chopper” amplifier without movable parts and possessing a direct current sensitivity better than 10−11 volt is described. Compactness of cryostat equipment and convenience of observation were factors controlling design.
A.R. De Vroomen, C. Van Baarle
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Current Noise of Chopper Amplifiers
2018This chapter investigates the root cause of 1/f2 noise of chopper amplifiers through a theoretical analysis and measurements of several chopper IAs. It is well known that the charge injection and clock feedthrough associated with the MOSFETs of the input chopper give rise to significant input current and current noise, which may then be a significant ...
Jiawei Xu +3 more
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Optimization of chopper amplifiers for speed and gain
IEEE Journal of Solid-State Circuits, 1994This paper presents design techniques to optimize the performance of chopper-stabilized ac-coupled CMOS inverter amplifiers. These amplifiers are used as comparators in highspeed flash analog-to-digital converters. For any given process technology, as the required conversion speed and resolution are increased, the amplifiers are required to increase ...
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Low power chopper amplifier without LPF
2010 IEEE Asia Pacific Conference on Circuits and Systems, 2010Chopping technique is an efficient approach to decrease the 1/f noise and low-frequency offset of CMOS amplifiers, but conventional chopper amplifier consumes large power because it required a wide-band amplifier exceed a chopping frequency and a post low pass filter (LPF) for eliminating modulation noise.
Xiao Yang +3 more
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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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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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