An Improved-Accuracy Approach for Readout of Large-Array Resistive Sensors

Journal article (2016)

Authors

Roohollah Yarahmadi Ferdowsi University of Mashhad

Amin Safarpour Ferdowsi University of Mashhad

R. Lotfi Bio-Electronics -

Research Group

Electronics () (TU Delft)

Crosstalk Large-array sensors Resistive pressure sensors Readout circuits Operational amplifier non-idealities

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http://resolver.tudelft.nl/uuid:13547291-578f-481e-bb3c-3ab3c7fb170c

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Published Date

2016

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronics

Abstract

Large-array resistive sensors have found a variety of applications from industrial instrumentation to medical wearable applications. In such large-array sensors, several non-idealities limit the accuracy of the readout circuit. In this paper, after analyzing the crosstalk error caused by the input offset voltage and input bias current of the operational amplifier, a novel double-sampling technique is proposed to considerably reduce the error. Spice simulation results of a 20 × 20 array confirm that for a 1-MQ resistance, the proposed technique can decrease the maximum measureable relative error from 20% to 0.089%. Furthermore, the measurement results of a 20 × 20 array confirm that for a resistance value of 19 MQ being measured, the proposed technique can reduce the error from 84% to 0.69%.