BANDGAP REFERENCE VOLTAGE GENERATING CIRCUIT AND ELECTRONIC SYSTEM USING THE SAME

摘要

A bandgap reference voltage generating circuit for providing a reference voltage is disclosed. The bandgap reference voltage generating circuit includes four-terminal current source circuit, a regulator circuit and a temperature-compensating circuit. The four-terminal current source circuit outputs a first voltage, a second voltage and a first current which are independent of variation of a first system voltage. The regulator circuit receives the first voltage and the second voltage and when the first system voltage is larger than a threshold voltage value, the regulator circuit outputs the reference voltage independent of variation of the first system voltage via voltage-difference between the first voltage and the second voltage. The temperature-compensating circuit receives the first current and compensates a temperature curve of the reference voltage outputted from the regulator circuit.

主权项

1. A bandgap reference voltage generating circuit, used for providing a reference voltage, the bandgap reference voltage generating circuit, comprising:
a four-terminal current source circuit, electrically connected to a first system voltage, wherein when the first system voltage is larger than a threshold voltage value, a first voltage, a second voltage and a first current outputted from the four-terminal current source circuit are independent of variation of the first system voltage; a regulator circuit, electrically connected to the four-terminal current source circuit, wherein when the regulator circuit receives the first voltage and the second voltage, and when the first system voltage is larger than the threshold voltage value, the reference voltage outputted from the regulator circuit is independent of variation of the first system voltage via voltage difference steadily between the first voltage and the second voltage; and a temperature-compensating circuit, electrically connected to the four-terminal current source circuit and the regulator circuit, wherein the temperature-compensating circuit receives the first current and compensates temperature curve of the reference voltage outputted from the regulator circuit.