Improved FRZPC for the two‐dimensional resistive sensor array

Abstract

With M sampling operational amplifiers (op-amps) in negative feedback, the fast readout zero potential circuit (FRZPC) can simultaneously access M elements in the M × N resistive sensor array with the shared row–column fashion but it suffered from the crosstalk problem caused by the switch-on resistance of the column multiplexers, the non-scanned elements and the size of the array. For suppressing the crosstalk problem, the authors proposed an improved FRZPC, called IFRZPC, by introducing one more op-amp in negative feedback to sample the current in the ground to the array direction. Then, in the FRZPC and the IFRZPC, the effects of different parameters of the resistive sensor array and the readout circuit on the measurement accuracy of the elements being tested were simulated using National Instrument Multisim. Simulations and comparative experiments were performed and demonstrated that IFRZPC, though requiring M + 1 op-amps, M + 1 resistors, and M + 1 sampling channels, could simultaneously access M elements being tested on the same column in the M × N resistive sensor array with a better accuracy.