Patent ID: 11899487
Assignee: WILL SEMICONDUCTOR CO., LTD.SHANGHAI
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A reference voltage circuit, comprising:
a first current source, through which a first current is made to flow;
a second current source, through which a second current set at a certain ratio to the first current is made to flow;
a first current path, which comprises a second resistor, a first resistor, and a first bipolar transistor that are connected to the first current source in a sequential manner, and through which the first current is made to flow;
a second current path, which comprises a third resistor and a 0th bipolar transistor that are connected to the second current source in a sequential manner, and through which the second current is made to flow;
an operational amplifier, which controls current amounts of the first current and the second current by an output from an output end, and of which a positive input end is connected to a connection point between the second resistor and the first resistor, and of which a negative input end is connected to a connection point between the third resistor and the 0th bipolar transistor; and
a buffer amplifier, which outputs a reference voltage, and of which a positive input end is connected to a connection point between the second current source and the third resistor, and of which a negative input end is connected to an output end; wherein
an area ratio of the first bipolar transistor to the 0th bipolar transistor is n:1, and
a reference voltage of which temperature dependence is corrected is obtained by adjusting resistance values of the first and the third resistor and a value of the area ratio n.