Results 241 to 250 of about 297,887 (290)
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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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Low level transistorized chopper amplifier
IRE Transactions on Telemetry and Remote Control, 1957Low-level transistorized chopper amplifiers have been constructed for a specific missile application. With minor modifications, these amplifiers can meet the requirements for general usage. The chopper is capable of processing 900 signals per second at a common mode rejection of 1000:1. The gain is smoothly adjustable ± 20 percent of full scale and the
Harold F. Harris, T. Eugene Smith
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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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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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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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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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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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Auto Correction Feedback for Ripple Suppression in a Chopper Amplifier
IEEE Journal of Solid-State Circuits, 2009This paper proposes a local feedback, named Auto Correction Feedback (ACFB), used in a chopper amplifier to suppress its offset related ripple. It nulls out amplifier's offset in DC domain which would otherwise become modulated ripple at the chopper amplifier's output, instead of filtering the ripple by a post filter.
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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
semanticscholar +1 more source