Eliminating the effects of the temperature coefficients of series resistance on temperature sensors

摘要

An embodiment of the present invention is directed to a method for reducing the effects of temperature coefficients of series resistance in a temperature sensing circuit having a temperature sensing element. The currents through the temperature sensing element are relatively constant over temperature. The method includes adjusting the gain of an analog to digital converter to compensate for the change in current densities in the temperature sensing element multiplied by a characterized temperature coefficient of the series resistance of a signal path of the temperature sensing circuit. The method also includes adjusting an offset of the analog to digital converter to compensate for the change in current densities in the temperature sensing element multiplied by a characterized resistance of the signal path of the temperature sensing circuit.