Patent ID: 7834611
Filing Date: 2010-11-16
Classification: G05F,G11C

Abstract:
1. A bandgap reference generating circuit comprising: an operational amplifier configured to generate a bandgap reference voltage; and a gain controller configured to control a gain of the operational amplifier to have different values in a normal mode and a low power mode, respectively, wherein the operational amplifier comprises: wherein the gain controller includes a first control switching unit configured to control a current of the comparator to have different values in the normal mode and the low power mode, respectively, and wherein the first control switching unit comprises: a first MOS transistor configured to switch on the current of the comparator in the normal mode; and a second MOS transistor configured to switch on the current of the comparator in the low power mode, wherein the first MOS transistor has a larger channel width than the second MOS transistor.