An electronic device comprising a housing, a thermistor, a calibration resistor and a chip disposed in the housing, wherein the thermistor is configured to convert a temperature signal of a measured object to a resistance signal, wherein the chip comprising a temperature measurement circuit, wherein the temperature measurement circuit comprises:
- an unloaded contactor;
- a differential amplifier circuit, wherein a non-inverting input terminal of the differential amplifier circuit is selectively connected to one of the following components:
- the unloaded contactor, a thermistor and a calibration resistor;
- and
- a conversion circuit connected to the differential amplifier circuit,
- wherein in a first period, the non-inverting input terminal of the differential amplifier circuit is connected to the unloaded contactor, and the differential amplifier circuit outputs an offset voltage,
- in a second period, the non-inverting input terminal of the differential amplifier circuit is connected to the calibration resistor, and the differential amplifier circuit outputs a calibration voltage, and
- in a third period, the non-inverting input terminal of the differential amplifier circuit is connected to the thermistor, and the differential amplifier circuit outputs a temperature measurement voltage of the measured object;
- and
- wherein the conversion circuit is configured to obtain the temperature signal of the measured object based on the offset voltage, the calibration voltage, and the temperature measurement voltage.