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A chopper dc instrumental amplifier
Measurement Techniques, 1987Because of their low zero drift chopper, dc amplifiers [I, pp. 22-23] are widely used in measuring equipment. The ratio of the maximum cut-off frequency of such an amplifier to its modulation frequency must be carefully chosen since an increase of its carrier frequency magnifies the effect of high-frequency pulse noise on the output voltage [2] in ...
A. E. Gudilin, S. V. Zhmak
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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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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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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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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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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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A Fill-In Technique for Robust IMD Suppression in Chopper Amplifiers
IEEE Journal of Solid-State Circuits, 2021In chopper amplifiers, the interaction between the input signal and the chopper clock can give rise to intermodulation distortion (IMD). This chopper-induced IMD is mainly due to amplifier delay, which causes large pulses at the output of the amplifier's output chopper.
Thije Rooijers +4 more
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A fully integrated CMOS chopper amplifier
[1991] Proceedings Fourth Annual IEEE International ASIC Conference and Exhibit, 2002A CMOS chopper amplifier that achieves reduced input offset voltage and fast overload recovery time while maintaining bandwidths comparable to conventional operational amplifiers and requiring no external components is presented. The chopper amplifier consists of two folded cascode operational transconductance amplifiers (OTA) connected in a switched ...
D. Garrity, J. Young, D. Thelen
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CMOS chopper amplifier for chemical sensor
[1991] Conference Record. IEEE Instrumentation and Measurement Technology Conference, 1992A highly sensitive CMOS chopper amplifier used for an oxygen probe is described. It is integrated in a 2- mu m double-poly p-well CMOS process. The chip uses only a single 5-V voltage source, and no external components are needed. It is realized by a current mode chopper technique in order to overcome the low-frequency noise and drift problems.
S.-J. Wei, H.C. Lin
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