Patent ID: 9726705
Date: 2017-08-08
CPC Classifications: G01R

Claim:
1. A sensor interface circuit, comprising: first and second input terminals; a resistive bridge circuit including a pair of parallel resistive branches connected between the first and second input terminals, both resistive branches including an output terminal disposed between serially arranged resistors of the resistive branches; a first switch connected to the first input terminal and in series with the resistive branches for connecting a first voltage source to both resistive branch output terminals; a second switch connected to the second input terminal and in series with the resistive branches for connecting a second voltage source to both resistive branch output terminals; a first voltage source connected to the first input terminal through the first switch; a second voltage source connected to the second input terminal through the first switch; and a voltage differential measurement module connected to the resistive branch output terminals wherein the sensor interface circuit has a first configuration and a second configuration, the first switch being closed and the second switch being open in the first configuration, the first switch being open and the second switch being closed in the second configuration, wherein the differential measurement module is compare a differential voltage measurement acquired in the first configuration with a differential measurement acquired in the second configuration to determine at least one of magnitude and leakage in the circuit.