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Linear Readout Circuit for Simultaneously Accessing Two Elements in the Two-Dimensional Resistive Sensor Array
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DOI：10.1109/JSEN.2021.3117279.png)
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Abstract
En 中文
Most readout circuits of the two-dimensional resistive sensor array (2-D RSA) have a non-linear relationship between the output voltage and the resistance of the element being tested (EBT), which will cause extra measurement error for the finite precision of the analog-to-digital converter. Firstly, we designed a novel linear readout circuit based on double voltage feedback loops (LRC-DVFL) which could access two elements in the array simultaneously, and the output voltages had a linear relationship with the resistances of the EBTs. Then, the approximate circuit model of the LRC-DVFL was derived and the mathematical equivalent resistance expressions of the EBTs were derived in Appendix. Followed, the simulation experiments and the test experiments with a prototype circuit of the LRC-DVFL were carried out. Experimental results show that the LRC-DVFL can access two elements in the 2-D RSA simultaneously with linear output voltages, and the performance of the LRC-DVFL can be evaluated quickly by using the mathematical equivalent resistance expressions of the EBTs.
Keywords:
Sensors
Sensor arrays
Integrated circuit modeling
Switches
Resistance
Measurement errors
Mathematical models
2-D resistive sensor array
measurement error
readout circuit
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