Analysis of a Novel Circuit Arrangement to Suppress Crosstalk in 2-D Resistive Sensor Arrays

Abstract

The multiplexed resistive arrays simplify the data collection with reduced connections and circuit complexity. However, the effect of crosstalk in these cases becomes inevitable. The crosstalk is caused due to the leakage currents in the multiplexer channels as well as the parasitic paths among the non-selected elements in the array. This paper analyses a circuit arrangement capable of suppressing crosstalk in 2D resistive sensor arrays. The proposed circuit employs transistors and diodes to modify simple voltage feedback commonly used for crosstalk reduction. The paper includes simulation results, approximate mathematical model for the “element under measurement” and other practical aspects of the circuit arrangement, such as the array size or the bias resistance. Finally, the circuit is compared (based on the simulation results) with two known circuit arrangement from the literature. The suggested circuit is clearly capable of eliminating crosstalk better than previously known methods. The analysis also reveals that the circuit is sensitive to temperature variations and must be modeled with temperature calibration factors for better model accuracy.