Patent attributes
A temperature sensing circuit that includes a bandgap voltage generation circuit, a current mirror branch, a variable resistor, a comparator circuit, a control circuit and a temperature determining circuit. The bandgap voltage generation circuit generates a bandgap voltage. The current mirror branch generates a mirrored current mirrored from the bandgap voltage generation circuit. The variable resistor is electrically coupled to the current mirror branch to receive the mirrored current to generate a variable voltage. The comparator circuit compares the bandgap voltage and the variable voltage to generate a comparison result. The control circuit generates a control signal according to the comparison result to adjust the resistance of the variable resistor and outputs a signal value when the signal value forces the variable voltage to be equal to the bandgap voltage. The temperature determining circuit generates a temperature value according to the signal value.
