A temperature sensing circuit.

摘要

A temperature sensing circuit (1) has a first insulated gate field effect device (2) which is operated deep into its subthreshold region where the voltage across the device (2) varies with temperature and a second insulated gate field effect device (3) which is operated in an area of its square law region where the voltage across the second insulated gate field effect device (3) is substantially independent of temperature. A comparator (4) compares the voltage across the first and second devices (2 and 3) and provides a signal OT indicating the temperature sensed by the first insulated gate field effect device. <IMAGE>