Patent ID: 7633280

Claim:
Voltage regulator circuitry comprising: (a) a differential input stage including a first input coupled to receive a reference voltage, a second input coupled to a regulated output conductor of the voltage regulator circuitry, and an output; (b) an output stage for producing a regulated output voltage on the regulated output conductor, including a first output transistor having a first electrode coupled to a first supply voltage and a second electrode coupled to the regulated output conductor, a second output transistor having a first electrode coupled to a second supply voltage and a second electrode coupled to the regulated output conductor, and a cascode transistor having a first electrode coupled to a control electrode of the second output transistor and a second electrode coupled to a control electrode of the first transistor; and (c) a gain stage including (1) a first signal path including the second input and output of the differential input stage, a first follower transistor having a first electrode coupled to the regulated output conductor, a control electrode coupled to the output of the differential input stage, and a second electrode coupled to a control electrode of the second output transistor, and (2) a second signal path including a second follower transistor having a control electrode coupled to the output of the differential input stage, a first electrode coupled to the regulated output conductor, and a second electrode coupled to a second electrode and a control electrode of a first current mirror transistor and the control electrode of a second current mirror transistor having a second electrode coupled to a control electrode of an amplifying transistor having a second electrode coupled to a control electrode of the second output transistor, first electrodes of the first and second current mirror transistors and the amplifying transistor being coupled to the second supply voltage, a current source being coupled to the control electrode of the second output transistor.