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This paper aims at designing a compact readout system for chemiresistive sensor array with high speed and high accuracy. The proposed scheme is based on Resistance-to-Voltage (R-V) conversion and targets high density wide ranged chemiresistive sensor, with input resistance range of 1 <inline-formula> <tex-math notation="LaTeX">$\text{K}\Omega $ </tex-math></inline-formula>- 1 <inline-formula> <tex-math notation="LaTeX">$\text{M}\Omega $ </tex-math></inline-formula> and 0.1&#x0025; sensitivity. The proposed approach uses Adaptive Reference Resistor Tuning (ARRT) technique implemented with a digital variable potentiometer to achieve a high accuracy without sacrificing the dynamic range and the speed. The system is implemented on a printed circuit board with a microcontroller and a 16-bit Analog-to-Digital Converter (ADC), and it has a compact dimension of 10 cm <inline-formula> <tex-math notation="LaTeX">$\times6$ </tex-math></inline-formula> cm, which is suitable for portable applications. The readout system works with a 5 V power supply, and the overall system power consumption is 150 mW. The system is designed to interface with a 118 sensor array and the experimental results achieved a satisfactory accuracy of 0.88&#x0025;, as well as a measuring speed of 8.5 ms per sensor. Compared with existing approaches, our work targets a high density wide ranged chemiresistive sensor array and demonstrated high accuracy, high speed with the lowest circuit complexity, which is the novelty of this work.

A Readout System for High Speed Interface of Wide Range Chemiresistive Sensor Array