Measurement and Analysis of Current Noise in Chopper Amplifiers

Jiawei Xu, Qinwen Fan, Johan H. Huijsing, Chris Van Hoof, Refet Firat Yazicioglu, Kofi A.A. Makinwa

Research output: Contribution to journalArticleScientificpeer-review

53 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)1575-1584
Number of pages10
JournalIEEE Journal of Solid State Circuits
Issue number7
Publication statusPublished - 2013

Bibliographical note

Accepted Author Manuscript


  • Charge injection
  • chopper amplifier
  • chopping
  • current noise
  • high-impedance sensors
  • $1/f^{2}$noise


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