Readout circuit based on double voltage feedback loops in the two‐dimensional resistive sensor array: design, modelling and simulation evaluation

With one voltage feedback loop, the traditional voltage feedback readout circuit could access all elements in the two‐dimensional (2D) resistive sensor array with the shared row–column fashion but it suffered from the low readout rate problem for in it only one element could be selected and measured at the same time. First, the authors designed a novel readout circuit based on double voltage feedback loops (RC‐DVFLs) which could access two elements in the array simultaneously. Then, an approximate circuit model of the RC‐DVFL was presented and its mathematical equivalent resistance expressions of the elements being tested were analytically derived. Followed, the RC‐DVFL and its expressions were evaluated by simulation experiments and test experiments with a prototype circuit of the RC‐DVFL. The experiment results show that two elements in the 2D resistive sensor array can be accessed with the RC‐DVFL but only part crosstalk is suppressed, and the mathematical equivalent resistance expressions of the elements being tested can be used as the general formulas to evaluate the performance of the RC‐DVFL.