Characterization of the RFI Rectification Behavior of Instrumentation Amplifiers

Chunyu Wu, Guanghua Li, David J. Pommerenke, Victor Khilkevich, Gary Hess

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, the rectification behavior of popular in-amps (instrumentation amplifiers) is measured in both common- and single-ended RF noise injection modes. It is recommended that AD8221 be used in common mode RF noise injection environment, and AD8220 and AD8429 be used in single-ended RF noise injection environment. The mechanism of RF noise rectification inside in-amps is also discussed. It is verified that rectification mainly happens at the non-inverting input of two op-amps in the first stage of an in-amp. The DC voltage difference between inverting input and non-inverting input of the in-amp is further amplified, which will cause a large DC offset at the output. It is shown that symmetry of the first stage in an instrumentation amplifier is very important. The asymmetry of the first stage will increase the DC offset at the output dramatically.

Original languageEnglish
Title of host publication2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity, EMC, SI and PI 2018
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Electronic)9781538666210
DOIs
Publication statusPublished - 17 Oct 2018
Externally publishedYes
Event2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity, EMC, SI and PI 2018 - Long Beach, United States
Duration: 30 Jul 20183 Aug 2018

Publication series

Name2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity, EMC, SI and PI 2018

Conference

Conference2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity, EMC, SI and PI 2018
CountryUnited States
CityLong Beach
Period30/07/183/08/18

Keywords

  • instrumentation amplifier
  • Measurement
  • RFI rectification

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Signal Processing
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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  • Cite this

    Wu, C., Li, G., Pommerenke, D. J., Khilkevich, V., & Hess, G. (2018). Characterization of the RFI Rectification Behavior of Instrumentation Amplifiers. In 2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity, EMC, SI and PI 2018 [8495427] (2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity, EMC, SI and PI 2018). Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/EMCSI.2018.8495427