Patent ID: 7204638

Claim:
A temperature sensor with programmable calibration, comprising: a reference circuit generating a first reference voltage with a negative temperature coefficient at a first output and a second reference voltage with a positive temperature coefficient at a second output, where said second reference voltage is generated across a first programmable resistive means, where a tap of said first programmable resistive means generates a third reference voltage with a positive temperature coefficient where a change of said tap changes the slope of said third reference voltage; a first amplifying circuit coupled to said first output of said reference circuit to generate by means of a first current source a first current directly proportional to said first reference voltage and the reciprocal of a first resistive means; a second amplifying circuit coupled to said second output of said reference circuit to generate by means of a second current source a second current directly proportional to said second reference voltage and the reciprocal of a second resistive means; and a plurality of temperature sensing circuits each coupled to outputs of said first current source, said plurality of temperature sensing circuits each comprising, coupled serially, a third resistive means and a second programmable resistive means to generate an output reference voltage at said output of said first current source for each of said plurality of temperature sensing circuits, where the junction of said third resistive and said second programmable resistive means is coupled to the output of said second current source, thus summing said first and said second currents in said second programmable resistive means.