A programmable biopotential aquisition front-end with a resistance-free current balancing instrumentation amplifier

Paul Faragó*, Robert Groza, Sorin Hintea, Peter Söser

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The development of wearable biomedical equipment benefits from low-power and low-voltage circuit techniques for reduced battery size and battery, or even battery-less, operation. This paper proposes a fully-differential low-power resistance-free programmable instrumentation amplifier for the analog front-end of biopotential monitoring systems. The proposed instrumentation amplifier implements the current balancing technique. Low power consumption is achieved with subthreshold biasing. To reduce chip area and enable integration, passive resistances have been replaced with active equivalents. Accordingly, the instrumentation amplifier gain is expressed as the ratio of two transconductance values. The proposed instrumentation amplifier exhibits two degrees of freedom: one to set the desired range and the other for finetuning of the voltage gain. The proposed IA is employed in a programmable biopotential acquisition front-end. The programmable frequency-selective behavior is achieved by having the lower cutoff frequency of a Gm-C Tow-Thomas biquad varied in a constant-C tuning approach. The proposed solutions and the programmability of the operation parameters to the specifications of particular bio-medical signals are validated on a 350nm CMOS process.

Original languageEnglish
Pages (from-to)85-92
Number of pages8
JournalAdvances in Electrical and Computer Engineering
Volume18
Issue number2
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Analog processing circuits
  • Biomedical monitoring
  • Biomedical signal processing
  • Operational amplifiers
  • Programmable circuits

ASJC Scopus subject areas

  • Computer Science(all)
  • Electrical and Electronic Engineering

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