Patent ID: 7341374
Filing Date: 2008-03-11
Classification: G01K

Abstract:
1. A temperature measurement circuit comprising: a current excitation circuit for sequentially applying at least two currents to a thermal sensor, from which at least two output signals are correspondingly generated; a calculation circuit for, in response to the at least two output signals, calculating an analog temperature signal representative of a temperature detected by the thermal sensor; a calibration factor generator for generating a calibration factor, wherein the calibration factor is calculated when the current excitation circuit sequentially applies at least three currents to the thermal sensor, and is used for calibrating a constant-term offset of the analog temperature signal, wherein the constant-term offset is caused by at least one series parasitic resistance of the thermal sensor; and an analog-to-digital conversion circuit for converting the analog temperature signal into a digital temperature signal in accordance with a reference level for conversion, wherein the reference level for conversion is shifted in accordance with the calibration factor.