A DC-coupled biomedical radar sensor with analog DC offset calibration circuit

Dongyang Tang, Jing Wang, Zhengyu Peng, Yi Chyun Chiang, Changzhi Li

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

5 Scopus citations

Abstract

A common problem of biomedical radar sensors is the DC offset at the output of radar receiver front-end. In this paper, a DC-coupled Doppler radar sensor system with an analog DC offset calibration circuit is proposed. The calibration circuit can track the change of DC offset continuously, and automatically remove the offset on the fly or in a controlled manner. The proposed calibration circuit uses pure analog components and does not require any digital signal processing (DSP) or software configuration. Compared to existing digitized solutions, the proposed analog calibration technique has the advantage of low cost, low complexity, extremely small delay, and very high resolution. Experiment demonstrates that input signals with a wide range of input DC offset can be processed. Hence the dynamic range of the baseband variable gain amplifier (VGA) can be maximized. Furthermore, the proposed DC offset calibration architecture can be easily adopted by other systems which also face DC offset problem.

Original languageEnglish
Title of host publicationI2MTC 2018 - 2018 IEEE International Instrumentation and Measurement Technology Conference
Subtitle of host publicationDiscovering New Horizons in Instrumentation and Measurement, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-6
Number of pages6
ISBN (Electronic)9781538622223
DOIs
StatePublished - Jul 10 2018
Event2018 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2018 - Houston, United States
Duration: May 14 2018May 17 2018

Publication series

NameI2MTC 2018 - 2018 IEEE International Instrumentation and Measurement Technology Conference: Discovering New Horizons in Instrumentation and Measurement, Proceedings

Conference

Conference2018 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2018
CountryUnited States
CityHouston
Period05/14/1805/17/18

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Keywords

  • DC offset
  • Doppler radar
  • biomedical radar sensor
  • calibration
  • dynamic range
  • front-end
  • mixer
  • motion sensor
  • receiver
  • variable gain amplifier (VGA)
  • vital signs

Cite this

Tang, D., Wang, J., Peng, Z., Chiang, Y. C., & Li, C. (2018). A DC-coupled biomedical radar sensor with analog DC offset calibration circuit. In I2MTC 2018 - 2018 IEEE International Instrumentation and Measurement Technology Conference: Discovering New Horizons in Instrumentation and Measurement, Proceedings (pp. 1-6). (I2MTC 2018 - 2018 IEEE International Instrumentation and Measurement Technology Conference: Discovering New Horizons in Instrumentation and Measurement, Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/I2MTC.2018.8409872