Patent ID: 6890097

Claim:
A temperature measuring sensor that is incorporated in a substrate of a semiconductor device to measure a real temperature of said substrate, which sensor comprises: a semiconductor diode formed in said substrate; and a resistor formed in said substrate and connected to said semiconductor diode in series, wherein a first forward constant current is supplied to said semiconductor diode through said resistor such that a potential difference V A1 is produced between terminal ends of both said semiconductor diode and said resistor connected in series, and such that a potential difference V F1 is produced between terminal ends of said semiconductor diode; a second forward constant current is supplied to said semiconductor diode through said resistor such that a potential difference V A2 is produced between terminal ends of both said semiconductor diode and said resistor connected in series, and such that a potential difference V F2 is produced between terminal ends of said semiconductor diode; and the measurement of said real temperature is carried out based on said four potential differences V A1 , V F1 , V A2 and V F2 .