A 2ND-order continuous-time delta-sigma modulator for photoplethysmography analog front-end

Eka Fitrah Pribadi, Rajeev Kumar Pandey, Paul C.P. Chao*

*Corresponding author for this work

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

Abstract

A brief presents a 2nd order continuous-time delta-sigma modulator (CT-DSM) using a low pass filter to reduce the slew rate requirement of the output swing of the first integrator. By adding the low pass filter, the desired transfer function of the CT-DSM is altered. Thus a feed-forward based compensation circuit is introduced to transform the altered transfer function to the original condition. The CT-DSM is designed with a bandwidth of 100 Hz to satisfy the requirement of photoplethysmogram (PPG) detection. The CT-DSM is simulated using CMOS 180 nm technology with the layout area 460 µm x 460 µm. The circuit uses a 1.8 V supply voltage and consumes 35.61 µW. The signal-to-noise ratio of the CT-DSM is 101.2 dB, while the SFDR is 99.1 dB.

Original languageEnglish
Title of host publicationASME 2020 29th Conference on Information Storage and Processing Systems, ISPS 2020
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791883600
DOIs
StatePublished - 2020
EventASME 2020 29th Conference on Information Storage and Processing Systems, ISPS 2020 - Virtual, Online
Duration: 24 Jun 202025 Jun 2020

Publication series

NameASME 2020 29th Conference on Information Storage and Processing Systems, ISPS 2020

Conference

ConferenceASME 2020 29th Conference on Information Storage and Processing Systems, ISPS 2020
CityVirtual, Online
Period24/06/2025/06/20

Keywords

  • Compensation circuit
  • CT-DSM
  • Low-pass filter
  • PPG signal

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