Patent ID: 7196505

Claim:
An apparatus for regulating voltage levels, the apparatus comprising: a first transistor and a second transistor coupled to the first transistor, the first transistor configured to receive a reference voltage, the second transistor configured to receive a feedback voltage and generate a first voltage, the first voltage being associated with a difference between the reference voltage and the feedback voltage; a third transistor coupled to the second transistor and configured to receive the first voltage from the second transistor and generate an output voltage in response to at least the first voltage; a fourth transistor coupled to the third transistor and configured to receive the output voltage from the third transistor and generate the feedback voltage; a first current generation system coupled to the fourth transistor through at least a node, the node being associated with the feedback voltage; and a compensation capacitor coupled to a gate of the third transistor and a source or a drain of the third transistor; wherein the feedback voltage is substantially equal to a difference between the output voltage and a second voltage, the second voltage related to one or more characteristics of the fourth transistor and being substantially constant.