A Unified Potentiostat for Electrochemical Glucose Sensors

A unified potentiostat circuit for both - and - based electrochemical glucose sensors was proposed and its function was verified by circuit simulations and measurement results of a fabricated chip. This circuit consisted of an operational amplifier, a comparator and current mirrors. The proposed circuit was fabricated with a thick oxide CMOS process and an active area of . The measurements revealed an input operation range from 0.5 V to 1.6 V in the - based bio-sensor and from 1.7 V to 2.6 V in the - based bio-sensor with a supply voltage of 3.3 V. The evaluation results showed that the proposed potentiostat circuit is suitable for measuring the electrochemical cell currents of both - and - based glucose sensors.

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