Balanced input for temperature sensor

Abstract

A balanced input circuit which is used with an operational amplifier to obtain the difference between two input signals. In a temperature sensor application, one input signal is proportional to absolute temperature (PTAT) and one signal is complimentary to absolute temperature (CTAT) with the CTAT signal being the base-emitter voltage (Vbe) of a bipolar transistor. In this application the operational amplifier output is the PTAT signal minus Vbe times a scale factor determined by the feedback loop of the operational amplifier.

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