An Optimization Approach to Eliminate Crosstalk in Zero-Potential Circuits for Reading Resistive Sensor Arrays

Crosstalk is a well-known problem in resistive sensor arrays (RSAs). The zero-potential method (ZPM) is a commonly used readout circuit that uses multiplexers and demultiplexers to reduce the main sources of crosstalk. However, the internal resistors of these switches cause a secondary crosstalk in the RSA that alters the RSA sensor values read. The solution to the effects of this secondary crosstalk is still a case of study. In previous literature, these resistances have been considered as known and, in most cases, equal for all switch channels. However, in a real situation, they are unknown and may vary between channels. In this work, a least-squares (LSQR) method is presented to obtain the true values of the switches from the read voltage signals. Calibration columns are added to the RSA for this purpose. To prove the performance of the method proposed, several simulations have been carried out with different values of RSA sensors, switch resistances, size of the RSA, and noise level. Results show that the proposed LSQR method allows obtaining simultaneously accurate values for both the RSA sensors and switch internal resistors. In this way, the problem of secondary crosstalk is neutralized. It also shows better performance when compared with existing approaches

Cable Crosstalk Suppression in Resistive Sensor Array with 2-Wire S-NSDE-EP Method

With long flexible cables connected to the 1-wire setting non-scanned-driving-electrode equipotential (S-NSDE-EP) circuit, the resistive sensor array modules got flexibility in robotic operations but suffered from the crosstalk problem caused by wire resistances and contacted resistances of the cables. Firstly, we designed a new S-NSDE-EP circuit using two wires for every driving-electrode and every sampling-electrode to reduce the crosstalk caused by the connected cables in the 2D networked resistive sensor array. Then, an equivalent resistance expression of the element being tested (EBT) for this circuit was analytically derived. Then, the 1-wire S-NSDE-EP circuit and the 2-wire S-NSDE-EP circuit were evaluated by simulations. The simulation results show that the 2-wire S-NSDE-EP circuit, though it requires a large number of wires, can greatly reduce the crosstalk error caused by wire resistances and contacted resistances of the cables in the 2D networked resistive sensor array

1995 BRAC Commission

Naval Research Lab: Military Value Data Call. Tabular data, memos, documents. Box 178, L-110