Design of a Voltammetry Potentiostat with Redox Current Sensing for Biomedical Applications

  • 伍 紹德

Student thesis: Master's Thesis

Abstract

This thesis presents a voltammetry potentiostat for biomedical sensors The proposed circuit can measure redox current generated by electrochemical reactions The redox detection circuit is realized to control the redox voltage and determine redox reactions and the current conveyor is adopted to maintain a stable potential at sensor terminal The range of sensor current is improved by the implemented current mirror Followed by the current-to-time converter the mirrored image of sensor current is transformed into time domain signal for back-end circuit processing The control amplifier circuit with scanning redox voltage is adopted in the three-electrode system for cyclic voltammetry measurement The proposed voltammetry potentiostat is designed to achieve high sensitivity low power and small area This proposed voltammetry potentiostat is implemented in TSMC 0 18-μm 1P6M CMOS technology and the chip area is about 0 49 mm2 It consumes 1 314 mW from 1 8 V supply voltage The fabricated IC measures the sensor current from 15 μA to 1500 μA with less than 0 3 % error In cyclic voltammetry measurement the proposed circuit has less than 0 7 % error with sweep redox voltage from 0 3 V to 1 1 V and the electrochemical measurement results of melatonin have been acquired
Date of Award2015 Aug 12
Original languageEnglish
SupervisorBin-Da Liu (Supervisor)

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