Aging calibration for temperature sensor

• Main Authors: Lin, Ta-Hsin, Huang, Jyun-Jia
• Format: Patent
• Language: English
• Published: 29.11.2022
• Subjects: MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; PHYSICS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

A thermal sensor with non-ideal coefficient elimination is shown. The thermal sensor has a bandgap circuit, a dual-phase voltage-to-frequency converter, and a frequency meter. The bandgap circuit outputs a temperature-dependent voltage. The dual-phase voltage-to-frequency converter is coupled to the bandgap circuit in the normal phase to perform a voltage-to-frequency conversion based on the temperature-dependent voltage, and is disconnected from the bandgap circuit in the coefficient capturing phase to perform the voltage-to-frequency conversion based on the supply voltage. The frequency meter is coupled to the dual-phase voltage-to-frequency converter to calculate the temperature-dependent frequency corresponding to the normal phase of the dual-phase voltage-to-frequency converter. The frequency meter also calculates the temperature-independent frequency corresponding to the coefficient capturing phase of the dual-phase voltage-to-frequency converter. The temperature-dependent frequency and the temperature-independent frequency are provided for temperature evaluation with non-ideal coefficient elimination.