High dynamic range photocurrent sensory circuit with a multi-transistor background light cancellation loop for photoplethysmography sensing

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this article, we present a new photocurrent sensory circuit with a three-transistor background light cancellation. We describe our innovative photocurrent sensor-based blood pressure measuring device using a resistor-based current-to-voltage converter with a background light cancellation (BLC) loop. The photocurrent sensor is implemented using 0.35 µm standard CMOS technology and has zero average power consumption. The post-layout simulation for the photocurrent sensor shows a 1.3 MΩ transimpedance gain, a referred input noise current of 11 pA, and can reject a DC photocurrent up to 200 µA. This high DC rejection has been achieved due to the newly proposed multi-transistor BLC loop integrated with the sensor.

Original languageEnglish
Article number2769
JournalElectronics (Switzerland)
Volume10
Issue number22
DOIs
Publication statusPublished - Nov 1 2021

Keywords

  • A current to voltage converter
  • DC photocurrent rejection
  • Dynamic range
  • PPG sensor

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Hardware and Architecture
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'High dynamic range photocurrent sensory circuit with a multi-transistor background light cancellation loop for photoplethysmography sensing'. Together they form a unique fingerprint.

Cite this