Measurement and Analysis of Current Noise in Chopper Amplifiers

Journal article (2013)

Authors

J. Xu Holst Centre
Q. Fan Microelectronics
J.H. Huijsing Electronic Instrumentation - EEMCS
K.A.A. Makinwa Electronic Instrumentation - EEMCS
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
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Published Date

2013

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This 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. In combi-
nation with high source impedances, this “chopper noise” is converted to voltage noise, which may then be a significant contributor to the amplifier’s total input-referred voltage noise. Chopper noise has a white power spectral density, whose magnitude is roughly proportional to the chopping frequency. Design guidelines are proposed to reduce chopper noise, as well as the use of a clock-boot-
strapped chopper, which generates significantly less noise than a traditional chopper.

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