Patent ID: 9030186
Filing Date: 2015-05-12
Classification: G05F,Y10S

Abstract:
1. A bandgap voltage reference and voltage regulator system, comprising: a bandgap voltage reference circuit; a voltage regulator circuit having a driver stage; an operational amplifier having an inverted input and a non-inverted input, wherein the operation amplifier is connected between the bandgap voltage reference circuit and the voltage regulator circuit, wherein the operational amplifier is shared by the bandgap voltage reference circuit and the voltage regulator circuit, and wherein the operational amplifier operates as a gain stage for the bandgap voltage reference circuit, and as an error amplifier for the driver stage of the voltage regulator circuit; and a start-up circuit directly connected to the inverted and non-inverted inputs of the operational amplifier, and to the output of the operational amplifier for detecting a regulator output voltage level and bringing up the system to a predetermined operating point, wherein the operational amplifier comprises: wherein the first stage of the operational amplifier comprises: