Patent ID: 7648271

Claim:
A temperature measurement system, wherein the temperature measurement system comprises: a variable current source that is operable to provide a first current and a second current; a transistor that is electrically coupled to the variable current source, wherein a first base-emitter voltage occurs when the first current is applied to the transistor, and wherein a second base-emitter voltage occurs when the second current is applied to the transistor; an n-factor coefficient register that stores an n-factor adjustment, wherein the n-factor adjustment is based at least in part on a difference between a first temperature from an external measurement sensor and a second temperature calculated using the first and second base-emitter voltages; an adder that is coupled to the n-factor coefficient register, wherein the adder combines a standard n-factor with the n-factor adjustment to generate a corrected n-factor; and an analog to digital converter (ADC) that is coupled to the adder and to the transistor, wherein the ADC is operable to receive the first base-emitter voltage and the second base-emitter voltage, and wherein the ADC is operable to provide a digital output based at least in part on the corrected n-factor, the first base-emitter voltage, and the second base-emitter voltage.