Patent ID: 7812663

Claim:
A bandgap voltage reference circuit, comprising: a first operational amplifier; a first transistor, a gate of the first transistor being coupled to an output end of the first operational amplifier, a source of the first transistor being coupled to a power supply, and a drain of the first transistor being coupled to a positive input end of the first operational amplifier; a second transistor, a gate of the second transistor being coupled to the output end of the first operational amplifier, a source of the second transistor being coupled to the power supply, and a drain of the second transistor being coupled to a negative input end of the first operational amplifier; a third transistor, a gate of the third transistor being coupled to the output end of the first operational amplifier, and a source of the third transistor being coupled to the power supply; a first resistor, a first end of the first resistor being coupled to the positive input end of the first operational amplifier; a second resistor, a first end of the second resistor being coupled to a drain of the third transistor; a first diode, a first end of the first diode being coupled to a second end of the first resistor, and a second end of the first diode being coupled to a ground; a second diode, a first end of the second diode being coupled to the negative input end of the first operational amplifier, and a second end of the second diode being coupled to the ground; and a divider, comprising: a second operational amplifier, a positive input end of the second operational amplifier being coupled to the negative input end of the first operational amplifier, a negative input end of the second operational amplifier being coupled to an output end of the second operational amplifier, and the output end of the second operational amplifier being coupled to the second end of the second resistor; and a third resistor, a first end of the third resistor being coupled to the first end of the second resistor, and a second end of the third resistor being coupled to the ground.