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%.
Original language | English |
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Pages (from-to) | 210-215 |
Number of pages | 6 |
Journal | IEEE Sensors Journal |
Volume | 16 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2016 |
Keywords
- crosstalk
- Large-array sensors
- resistive pressure sensors
- readout circuits
- operational amplifier non-idealities