Temperature measurement circuit and method

A temperature measurement circuit, comprising:

• a first temperature sensing circuit, a second temperature sensing circuit, a data processing unit, a PTAT (Proportional To Absolute Temperature) current source whose output current having a magnitude that is positively proportional to absolute temperature and a constant current source, wherein
• the first temperature sensing circuit is configured to generate a first measurement signal for characterizing temperature based on an inputted first current signal, a magnitude of the first current signal being correlated to temperature;
• the second temperature sensing circuit is configured to generate a second measurement signal for characterizing temperature based on an inputted second current signal, the second current signal being independent of temperature;
• an output terminal of the first temperature sensing circuit and an output terminal of the second temperature sensing circuit are connected to an input terminal of the data processing unit;
• the data processing unit is configured to determine a current temperature based on a first characteristic parameter corresponding to the first measurement signal and a second characteristic parameter corresponding to the second measurement signal, wherein
• a circuit parameter of the first temperature sensing circuit is the same as a circuit parameter of the second temperature sensing circuit;
• the PTAT current source is configured to generate the first current signal having a magnitude varying with temperature, the constant current source is configured to generate a second current source having a constant magnitude;
• an output terminal of the PTAT current source is connected to an input terminal of the first temperature sensing circuit;
• and
• an output terminal of the constant current source is connected to an input terminal of the second temperature sensing circuit.