Results 251 to 260 of about 16,903 (301)
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A gain-stabilised superconducting chopper amplifier
Journal of Physics E: Scientific Instruments, 1979Describes how the gain of a superconducting chopper amplifier can be stabilised by the application of negative feedback. The circuit has the additional advantages of high input impedance and excellent linearity.
R Fletcher, M R Stinson
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Low noise chopper amplifier calibration module
2016 IEEE Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC), 2016Marine CSEM (controlled source electromagnetic method) Acquisition Station needs to accurate observe two magnetic field components (Hx, Hy) and three electric field components (Ex, Ey, Ez). In this paper, a series of calibrations are made for the low noise chopper amplifier, which is used in the electric field signal acquisition hardware circuit.
null Si Wang +5 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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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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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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Low Power Bandgap Reference Using Chopper Amplifier
2021This paper describes design and implementation of low power Bandgap Reference (BGR) using chopper stabilized amplifier. The design focuses on reduction of power, output variation due to device mismatch and noise. First order compensated BGR with chopper amplifier is designed in CMOS-65 nm technology. Simulated across 18 process corners with temperature
Sujata S. Kotabagi +2 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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Low-power low-noise CMOS chopper amplifier
2010 International Conference on Anti-Counterfeiting, Security and Identification, 2010Chopping technique is an efficient approach to decrease the low-frequency offset and 1/f noise of amplifiers. In this paper, a low-power low-noise CMOS chopper amplifier is designed. This chopper amplifier is composed of a two-stage amplifier. The high output impedance of the first stage and the equivalent Miller capacitance of the second stage ...
Xiao Yang +3 more
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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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Improved sensitivity for the superconducting ’’chopper’’ amplifier
Review of Scientific Instruments, 1976A heterodyning modulation technique is described which results in an improved sensitivity for the superconducting chopper amplifier. Dc sensitivities of 3×10−12 V were obtained in a 1 Hz noise bandwidth. An experimental comparison of various modulation schemes is presented.
C. B. Friedberg, C. H. Galfo
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