Patent ID: 7439601

Claim:
A temperature sensor, comprising: a current source including a resistor R PTAT and generating a proportional to absolute temperature (PTAT) current I PTAT that is proportional to absolute temperature (T); a first current mirror coupled to the current source and having a first scaling factor N for scaling the PTAT current I PTAT by a factor of N to generate an N-scaled PTAT current; a temperature sensor resistor R TS coupled to the first current mirror; and an offset circuit coupled to the first current mirror and the temperature sensor resistor R TS , the offset circuit having a second scaling factor P and including an offset resistor R OFF and having a bandgap voltage V BG across the offset resistor R OFF , wherein the temperature sensor generates an output voltage V OUT across the temperature sensor resistor R TS , and wherein the offset circuit offsets the voltage across the temperature sensor resistor R TS by a voltage offset V OFF , wherein the voltage offset V OFF is the bandgap voltage V BG multiplied by the second scaling factor P and multiplied by the ratio of the temperature sensor resistor R TS to the offset resistor R OFF .