Patent ID: 7514987
Filing Date: 2009-04-07
Classification: G05F

Abstract:
1. A bandgap reference circuit, comprising: a current mirror comprising a control terminal, a first output terminal and a second output terminal; an operational amplifier comprising an output terminal coupled to the control terminal of the current mirror, and first and second input terminals; a first resistor coupled between the first output terminal of the current mirror and the first input terminal of the operational amplifier; a second resistor coupled between the first output terminal of the current mirror and the second input terminal of the operational amplifier; a third resistor comprising a first terminal coupled to the first input terminal of the operational amplifier, and a second terminal; a first transistor coupled between the second terminal of the third resistor and a ground voltage; a second transistor coupled between the ground voltage and the second input terminal of the operational amplifier; and a fourth resistor coupled between the first output terminal and the second output terminal of the current mirror.