Patent ID: 7078954
Filing Date: 2006-07-18
Classification: G01K

Abstract:
1. A temperature-sensing circuit comprising: a first circuit block outputting an output voltage having one of negative and positive temperature coefficients; a second circuit block comprising a resistive circuit configured to a predetermined resistive ratio, said second circuit block amplifying said output voltage of the first circuit block to a predetermined amplitude and outputting the amplified voltage as an output voltage of said second circuit block; and a third circuit block producing a voltage having temperature coefficients of a polarity opposite to said output voltage of said first circuit block and adding said produced voltage to said output voltage of the second circuit block to cancel out second order temperature coefficient components contained in said output voltages of both said first and second circuit blocks, wherein said second order temperature coefficient components are canceled out based on a voltage generated by the predetermined resistive ratio of said resistive circuit, and wherein resistances of said resistive circuit are trimmable to achieve the predetermined resistive ratio.