Circuit and method for generating a bandgap reference voltage

摘要

A bandgap reference voltage generator includes a bipolar assembly having a first resistor, a first branch and a second branch that is in parallel with the first branch. The first branch includes a first bipolar transistor with a base coupled to a fixed voltage. The second branch includes a second bipolar transistor with a base coupled to the fixed voltage and a second resistor coupled in series with the second bipolar transistor. A differential module is coupled to the first and second bipolar transistors and configured to balance the currents in the first and the second branches. The bandgap reference voltage is output at a node to which the first resistor is connected.

主权项

1. A circuit for generating a bandgap reference voltage, comprising:
a bipolar assembly, comprising a first resistor, a first branch coupled in series with the first resistor and a second branch coupled in parallel with the first branch, the first branch comprising a first bipolar transistor with a base coupled to a fixed voltage node, the second branch comprising a second bipolar transistor with a base coupled to said fixed voltage node and a second resistor coupled in series with the second bipolar transistor; and a module configured to balance currents in the first and the second branches, said module comprising an operational amplifier having a first input node coupled to a collector of the first bipolar transistor, a second input node coupled to a collector of the second bipolar transistor, and an output node coupled to the first resistor, the operational amplifier configured to maintain substantially equal the voltages at the first and second input nodes by controlling a current in the first resistor, wherein the bandgap reference voltage is configured to be provided at a node of the first resistor.