A Power-Efficient Current Readout Circuit with VCO-Based 2nd-Order CT ΔΣ ADC for Electrochemistry Acquisition

Hao Yun Lee, Peng Wei Huang, Ding Siang Ciou, Zhan Xian Liao, Shuenn Yuh Lee

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

Abstract

This paper presents an application specific integrated circuit (ASIC) for electrochemistry acquisition with a high power-efficient current readout circuit. The proposed ASIC includes a current-sensing voltage-controlled oscillator (VCO)-based continuous-time delta-sigma modulator (CTDSM), a decimation filter, an UART package generator and low-dropout regulators. The proposed VCO-based CTDSM features direct connection to the electrochemical sensor without pre-amplifier, which can directly quantize the reaction current signal to achieve a better power efficiency. Second order noise shaping is achieved by using an additional capacitor as a passive integrator and a dual-VCO structure as an integrator in phase domain. The digital circuitry mainly functions as a decimation filter and an UART package generator. The proposed ASIC implemented in TSMC 0.18μm CMOS process can achieve 73 dB dynamic range (DR) and power efficiency of 0.73 while consuming only 73.9 μW. The total chip area is 2.25 mm2.

Original languageEnglish
Title of host publication2020 IEEE Asian Solid-State Circuits Conference, A-SSCC 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728184364
DOIs
Publication statusPublished - 2020 Nov 9
Event16th IEEE Asian Solid-State Circuits Conference, A-SSCC 2020 - Virtual, Hiroshima, Japan
Duration: 2020 Nov 92020 Nov 11

Publication series

Name2020 IEEE Asian Solid-State Circuits Conference, A-SSCC 2020

Conference

Conference16th IEEE Asian Solid-State Circuits Conference, A-SSCC 2020
Country/TerritoryJapan
CityVirtual, Hiroshima
Period20-11-0920-11-11

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering
  • Instrumentation

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