A temperature-compensated bridge circuit

A bridge circuit is developed for canceling temperature drifts of resistive sensors. It consists basically of two half bridges with a common reference arm, each one followed by a differential amplifier. The gains of the amplifiers are adjusted such that the half-bridge output voltages due to temperature variation of sensors cancel each other. This scheme allows compensation for a large mismatch in the temperature sensitivity of sensors without degrading their inherent sensitivities. Experimental results are also presented to demonstrate the validity of this concept