A VFM-Based Crosstalk Suppression Circuit With Minimized Control Ports for Large-Scale Piezoresistive Sensor Arrays Using Analog Multiplexers

Piezoresistive sensor arrays enable intensive multi-parameter signal acquisition for regional measurements. However, these arrays pose a significant challenge for obtaining precise measurement results due to crosstalk from the resistors of adjacent rows and columns. Various acquisition circuits have been proposed to suppress crosstalk, with the most common being the voltage feedback method (VFM) and the zero potential method (ZPM). These methods typically rely on multi-pole double-throw (MPDT) switches as chip-selection components. A major drawback of such designs is the large number of control ports required, which limits the scalability of the sensor array. Herein, a new VFM-based solution to ameliorate the measurement circuit is proposed. Through replacing MPDT switches with analog multiplexers, and establishing row feedback using voltage-difference resistors, and obviating column feedback by diversion method, the number of control ports for a 32×32 array comprising 1,024 sensors was reduced from 64 to 10. Furthermore, a measurement errors of less than 0.07% can be achieved in simulation tests by using this newly designed circuit, and approximately 0.5% in actual tests.