Patent ID: 7557550
Filing Date: 2009-07-07
Classification: G05F,Y10S

Abstract:
1. A method comprising: using a stored energy source to generate a reference signal in response to a supply regulator being in a startup state, comprising enabling a first reference circuit in response to the regulator being in the startup state and calibrating a subcircuit of the first reference circuit in response to the regulator being in the startup state; using an output signal provided by the regulator to generate the reference signal in response to the regulator not being in the startup state, comprising enabling a second reference circuit other than the first reference circuit in response to the regulator not being in the startup state and causing the second reference circuit to use the calibrated subcircuit to generate the reference voltage; amplifying a signal indicative of a difference between the output signal and the reference signal to generate a control signal; and controlling an output stage of the regulator in response to the control signal.