Operational amplifier sharing based high-pass sigma-delta modulator with programmable feed-forward coefficients for ECG signal acquisition

Po Han Su, Kuan Lin Huang, Shuenn Yuh Lee

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

1 Citation (Scopus)

Abstract

A high-pass sigma-delta modulator (HPSDM) that uses operational amplifier (op-amp) sharing and programmable feed-forward coefficients is presented for an electrocardiography (ECG) signal detection system. Op-amp sharing is used to reduce the quantity of amplifiers because they dominate the entire power consumption of the HPSDM. Moreover, the amplitude of the ECG varies from person to person; hence, programmable feed-forward coefficients are used to adjust the dynamic range of HPSDM to obtain high resolution across users. This technique is implemented using the 0.18 μm standard CMOS process. Measurement results reveal that the proposed HPSDM has a signal-to-noise and distortion (SNDR) of 54.5 dB and a power of 2.25 μW under a 1.2 V supply voltage to achieve the figure of merit of 12.96 pJ/conv. In terms of other settings, the proposed HPSDM has an SNDR of 64.8 dB and a power of 5.2 μW under a 1.8 V supply voltage to achieve the figure of merit of 9.15 pJ/conv. Both modes extend the dynamic range of 12 dB according to the programmable feed-forward coefficients.

Original languageEnglish
Title of host publication2020 IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728133201
Publication statusPublished - 2020
Event52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Virtual, Online
Duration: 2020 Oct 102020 Oct 21

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
Volume2020-October
ISSN (Print)0271-4310

Conference

Conference52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020
CityVirtual, Online
Period20-10-1020-10-21

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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