Patent ID: 10983547

Abstract:
The present disclosure provides bandgap reference circuits having multi-level chopping actions to current mirror circuits for the purpose of reducing the flicker noise of the output reference voltage. A bandgap reference circuit includes a first current mirror including a pair of a first MOSFET and a second MOSFET, a second current mirror comprising a third MOSFET electrically connected to the first current mirror, and configured to provide a reference voltage at a drain, a first bipolar junction transistor electrically connected to the first current mirror, a second bipolar junction transistor connected to the first current mirror via a first resistor, a third bipolar junction transistor connected to the third MOSFET via a second resistor. The bandgap reference circuit further includes an operational amplifier to control the MOSFETs and a plurality of chopping switches configured to perform chopping actions on outputs of the first current mirror and the second current mirror.