Patent ID: 7423416
Filing Date: 2008-09-09
Classification: G05F

Abstract:
1. A voltage regulator comprising: a first metal oxide semiconductor (MOS) transistor having a first conductivity type, the first MOS transistor having a drain coupled to a first power supply voltage terminal, a gate for receiving a first bias voltage, and a source; a second MOS transistor having a second conductivity type different than the first conductivity type, the second MOS transistor having a source coupled to the first power supply voltage terminal, a drain coupled to the source of the first MOS transistor, and a gate for receiving a second bias voltage; a bipolar transistor having a collector coupled to the source of the first MOS transistor, a base for receiving a third bias voltage, and an emitter for providing an output voltage; and a first current source having a first terminal coupled to the emitter of the bipolar transistor, and a second terminal coupled to a second power supply voltage terminal; wherein the first MOS transistor and the second MOS transistor control a voltage level at the collector of the bipolar transistor in response to a varying power supply voltage provided to the first power supply voltage terminal.