A Resistance Deviation-to-Time Interval Converter Based on Dual-Slope Integration Using Second Generation Current Conveyors

Abstract

A resistance deviation-to-time interval converter based on dual-slope integration using second generation current conveyors (CCIIs) is designed for connecting resistive bridge sensors with a digital system. It consists of a differential integrator using CCIIs, a voltage comparator, and a digital control logic for controlling four analog switches. Experimental results exhibit that a conversion sensitivity amounts to 15.56 μs/Ω over the resistance deviation range of 0-200 Ω and its linearity error is less than ±0.02%. Its temperature stability is less than 220 ppm/℃ in the temperature range of -25-85℃.