Patent ID: 7746047
Filing Date: 2010-06-29
Classification: G05F

Abstract:
1. A LDO voltage regulator comprising: a differential amplifier circuit having a pair of input terminals and an output terminal, one input terminal coupled to a predetermined reference voltage; an intermediate amplifier circuit having an output terminal and an input terminal coupled to the output terminal of the differential amplifier circuit; and an output pass circuit including a pass transistor and an output capacitor, the pass transistor having a control terminal coupled to the output terminal of the intermediate amplifier circuit, an input terminal coupled to a power supply and an output terminal as a voltage output node, the output capacitor coupled between the voltage output node and a ground reference; a feedback circuit including a pair of ladder resistors coupled in series between the voltage output node and the ground reference, a node between the ladder resistors coupled to the other input terminal of the differential amplifier circuit; and a voltage controlled current source (VCCS) having an input terminal coupled to the voltage output node and an output terminal coupled to the node between the ladder resistors, wherein the VCCS includes four NMOS field effect transistors MN