Patent ID: 6507179
Filing Date: 2003-01-14
Classification: G05F

Abstract:
A bandgap circuit for providing a reference voltage, comprising:first and second circuit branches electrically connected between a supply voltage and a ground, the first circuit branch comprising a first input voltage node and a reference voltage node, and the second circuit branch comprising a second input voltage node; an input circuit connected to the first and second circuit branches and providing first and second input voltages at the first and second input voltage nodes, respectively; an amplifier having first and second input terminals connected to the first and second input voltage nodes, respectively, and an amplifier output terminal providing a first control signal representative of a difference between the first and second input voltages; a ripple rejection circuit connected to the supply voltage and the amplifier output terminal and providing a second control signal representative of a difference between the supply voltage and the first control signal; and a mirroring circuit connected to the ripple rejection circuit and providing first and second currents to the first and second circuit branches, respectively, according to the second control signal, the first current providing the reference voltage at the reference voltage node.