IEEE Sensors Journal, Volume (16), No (1), Year (2016-1) , Pages (210-215)

Title : ( An Improved-Accuracy Approach for Readout of Large-Array Resistive Sensors )

Authors: Roohollah Yarahmadi , Amin Safar Pour , Reza Lotfi ,

Citation: BibTeX | EndNote

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-M 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 M being measured, the proposed technique can reduce the error from 84% to 0.69%.

Keywords

, Index Terms—Large-array sensors, resistive pressure sensors, readout circuits, operational amplifier non-idealities, crosstalk.