Vol. 225, Issue 9, September 2018, pp. 63-68

Abstract: In this paper a new low power, low voltage CMOS read out circuit has been designed to interface array of liquid crystal chemical and biological sensors. Liquid crystal (LC) has been a promising sensor for detection of chemical and biological agents. Low contamination of chemical agents can be amplified using liquid crystal molecules. Array sensors reduce risk of false detection of low ppm agent presence. The designed circuit uses a low voltage, low frequency capacitance to time conversion technique in a differential sensor structure. Auto zero and offset cancellation are easily implemented in the design using a digital programmable counter circuit. The designed chip uses 5.5 µm² of chip area per channel and consumes 0.2 µW of power from a single 0.5 V supply.

Keywords: Liquid crystal sensor, Capacitive transduction, Chemical and biological sensors, Interface circuit, Low power.

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