Design and Crosstalk Error Analysis of the Circuit for the 2-D Networked Resistive Sensor Array

Abstract

By sharing rows and columns, the 2-D networked resistive sensor arrays simplified the interconnect complexity but suffered from the crosstalk problem among its elements. The crosstalk was mainly affected by the multiplexers' resistor, adjacent column elements, adjacent row elements, and array size. First, we designed an improved isolated drive feedback circuit (IIDFC) using one operational amplifier to reduce the crosstalk caused by the adjacent column elements in the 2-D networked resistive sensor array. Then, a mathematical equivalent resistance expression of the element being tested (EBT) for this circuit was analytically derived. Then, the IIDFC and its equivalent resistance expression of the EBT were evaluated by the simulations. The simulation results show that the IIDFC can greatly reduce the crosstalk error caused by the adjacent column elements in the 2-D networked resistive sensor array with the row-column fashion and its resistance expression of the EBT can be used as a general formula to evaluate the performance of the IIDFC.Index Terms-Resistive sensor array, measurement error, improved isolated drive feedback circuit (IIDFC), isolated drive feedback circuit (IDFC).

A Novel Crosstalk Suppression Method of the 2-D Networked Resistive Sensor Array

“…The influence of the column number had been significantly reduced with large number of op-amps using virtual ground technique [19,20] and with one op-amp using IIDFC [21]. In simulations, we fixed some parameters including the resistance value of the sample resistor and all elements in resistive sensor array at 10 kΩ, M or N at 8, R 0 at 1Ω, N or M was one of 8, 15, 29, 57, 113, 225, and 449.…”

“…From IIDFC [21], V rx is equal to V F , so the current on the EBT is equal to the current on the sample resistor ( R s ). Thus the equivalent resistance value of the EBT can be expressed as Equation (2): $R_{xy}=\frac{V_{cy}-V_{rx}}{V_F}(R_s+R_r)=\frac{2V_{I0}-V_I-V_F}{V_F}(R_s+R_r)$…”

Improving Accuracy in the Readout of Resistive Sensor Arrays

“…To reduce errors, due to the resistances of the switches that appear in (1), (2) Figure 4: Modified circuit based on the VFM proposed by Wu et al [26] to reduce the effects of crosstalk.…”

“…The error that occurs in estimating R ij using these equations will depend on Rs, on the size of the array (M and N), and the range of values of the resistances of the sensors [16,26].…”

“…In order to reduce crosstalk in the circuits based on the ZPM and VFM, Wu et al present two designs: one based on the ZPM [26] using two OAs and an additional resistor (errors in this method are evaluated in [27]) and another based on the VFM [28,29], which requires two additional resistors ( [30] uses this approach for a piezoresistive composite sensor array). Although the results obtained improve measurement accuracy, they still show errors due to crosstalk.…”