| US 7,557,550 B2 | ||
| Supply regulator using an output voltage and a stored energy source to generate a reference signal | ||
| Murthy R. Mellachurvu, Austin, Tex. (US); Scott D. Willingham, Austin, Tex. (US); Peter J. Vancorenland, Austin, Tex. (US); and G. Tyson Tuttle, Austin, Tex. (US) | ||
| Assigned to Silicon Laboratories Inc., Austin, Tex. (US) | ||
| Filed on Nov. 14, 2005, as Appl. No. 11/273,695. | ||
| Claims priority of provisional application 60/695780, filed on Jun. 30, 2005. | ||
| Prior Publication US 2007/0001657 A1, Jan. 04, 2007 | ||
| Int. Cl. G05F 1/56 (2006.01) | ||
| U.S. Cl. 323—281 [323/901; 363/49] | 6 Claims |
| 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.
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