A BJT-Based CMOS Body Temperature Sensor Analog Front-End with Dynamic Element Matching

Yongsu Kwon, Hyungseup Kim, Donggeun You, Hyunwoo Heo, Hyoungho Ko, Sangmin Lee

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper proposes a bipolar junction transistor (BJT) based complementary metal-oxide-semiconductor (CMOS) body temperature sensor analog front-end (AFE) with dynamic element matching (DEM). To reduce mismatches of current sources and transistors resulting from process spread, DEM is implemented. A chopper stabilization technique is implemented to minimize input offset at op-amp which forms a feedback loop to generate proportional-to-absolute-temperature (PTAT) currents in the temperature sensor core. The gain stage used to achieve high-resolution output of temperature sensor implements non-inverting amplifier using R-2R digital-to-analog converter (DAC) to perform amplification regardless of the output offset voltage of the temperature sensor core. The proposed temperature sensor is implemented in a $0.18\ \mu\mathrm{m}$ CMOS process, occupies 0.1 mm2, and consumes $4.85\ \mu\mathrm{A}$ from 3.3 V I/O and 1.8 V core voltage.

Original languageEnglish
Title of host publication2021 International Conference on Electronics, Information, and Communication, ICEIC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728191614
DOIs
Publication statusPublished - 31 Jan 2021
Event2021 International Conference on Electronics, Information, and Communication, ICEIC 2021 - Jeju, Korea, Republic of
Duration: 31 Jan 20213 Feb 2021

Publication series

Name2021 International Conference on Electronics, Information, and Communication, ICEIC 2021

Conference

Conference2021 International Conference on Electronics, Information, and Communication, ICEIC 2021
Country/TerritoryKorea, Republic of
CityJeju
Period31/01/213/02/21

Keywords

  • Body temperature sensor analog front-end (AFE)
  • Chopper stabilization technique
  • Dynamic element matching (DEM)
  • R-2R digital-to-analog converter (DAC)

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