1.2-V Energy-Efficient Wireless CMOS Potentiostat for Amperometric Measurements

Virgilio Valente, Nazanin Neshatvar, Evdokia Pilavaki, Matthew Schormans, Andreas Demosthenous

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Wireless biosensors are playing a pivotal role in health monitoring, disease detection and management. The development of wireless biosensor nodes and networks strongly relies on the design of novel low-power, low-cost and flexible CMOS sensor readouts. This brief presents a CMOS potentiostat that integrates a control amplifier, a dual-slope ADC and a wireless unit on the same chip. It implements a novel time-based readout scheme, whereby the counter of the dual-slope ADC is moved to the receiver and the sensor current is encoded in the timing between two wireless pulses transmitted via pulse-harmonic modulation across an inductive link. Measured results show that the potentiostat chip can resolve a minimum input current of 10pA at a sampling frequency of 125 Hz and a power consumption of 12 μW .

Original languageEnglish
Article number8851255
Pages (from-to)1700-1704
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume67
Issue number10
DOIs
Publication statusPublished - 2020

Keywords

  • Amperometry
  • biosensors
  • dual-slope ADC
  • potentiostat
  • pulse harmonic modulation
  • wireless

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