A brdige resistance deviation-to-time interval converter for resistive sensor bridge

Abstract

A bridge resistance deviation-to-time interval converter is presented for interfacing resistive sensor bridges. It consists of two voltage-to-current converters, two current-tunable Schmitt triggers, a ramp integrator, and two logic gates. A prototype circuit built using discrete components exhibits a conversion sensitivity amounting to 4527.8 mu s/Omega over the resistance deviation range of 0 - 2 Omega and a linearity error less than +/- 0.01%.