A circuit for the temperature compensation of capacitive sensors

A voltage reference which yields a voltage proportional to a reference voltage (V/sub REF/) and relative temperature (/spl Delta/T) is presented. The application, typically the interfacing of sensors whose output signal is proportional to V/sub REF/, is described. The principle of the voltage reference is presented as an arithmetic combination of temperature dependent sources and of a reference dependent source. The description of the realization of the main blocks is followed by the simulation results. The expected precision of the temperature measurement is better than 1/spl deg/C, for V/sub REF/ variations of /spl plusmn/10% around its nominal value.