Patent ID: 7812663
Filing Date: 2010-10-12
Classification: G05F

Abstract:
1. 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: