A Compact Current Conveyor CMOS Potentiostat Circuit for Electrochemical Sensors

Abstract

In this work, a new compact CMOS potentiostat circuit for electrochemical sensors is proposed. Integrated Potentiostats in CMOS technology are usually found in the literature designed with operational amplifiers performing both the electrochemical sensor bias and signal readout. In order to present alternative circuitry, a new potentiostat topology composed of a two-stage operational amplifier and a current conveyor circuit is proposed. The current conveyor is employed to perform the bias signal readout of an electrochemical cell with three electrodes. Simulations and experimental results of a discrete circuit version show that the proposed potentiostat topology yields results compliant with those of classical topologies presented in the literature.