High-resolution auto-balancing wheatstone-bridge with successive approximation of Δ Σ-Modulated digitally controlled variable resistor

Takumi Miyazaki, Shuya Nakagawa, Hiroki Ishikuro

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

2 Citations (Scopus)

Abstract

This paper describes a high-resolution, highly linear, low power amp-less sensor interface. A Wheatstone-bridge with ΔΣ-modulated digitally controlled variable resistor is proposed. The proposed bridge is automatically balanced by successive approximation (SA) of the digitally controlled resistor, which can eliminate power consuming amplifiers and ADCs. To overcome conversion speed limitation caused by settling time of each SA step, the output differential voltage of the bridge is shorted in advance to the comparison phase of each SA step. A developed prototype system achieved 9.68 bit resolution in target resistance range of three orders of magnitude and conversion speed improvement by 66%.

Original languageEnglish
Title of host publication2019 26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages474-477
Number of pages4
ISBN (Electronic)9781728109961
DOIs
Publication statusPublished - 2019 Nov
Event26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019 - Genoa, Italy
Duration: 2019 Nov 272019 Nov 29

Publication series

Name2019 26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019

Conference

Conference26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019
Country/TerritoryItaly
CityGenoa
Period19/11/2719/11/29

Keywords

  • Auto-balancing
  • IoT
  • Sensor interface
  • Successive approximation
  • Wheatstone-bridge
  • ΔΣ-modulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Optimization
  • Computer Networks and Communications
  • Hardware and Architecture

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