Patent ID: 8179111

Claim:
A circuit with a power-up sequence, the circuit comprising: a reference voltage generator configured to output a reference voltage at a second voltage level lower than a voltage supply at a first voltage level; one or more regulator modules, coupled with the reference voltage generator, and configured to: receive voltage supply at substantially the first voltage level; and regulate the received voltage supply to output a regulated voltage at substantially the second voltage level, the regulated voltage level set via a comparison to the reference voltage; one or more digital modules, coupled with at least a subset of the one or more regulator modules, and configured to be powered via the regulated voltage; one or more analog modules, coupled with the one or more digital modules, and configured to: receive voltage supply at substantially the first voltage level; and receive control signals from the one or more digital modules; and a control module, communicatively coupled with the one or more regulator modules, one or more digital modules, and one or more analog modules, and configured to: control at least a subset of the one or more regulator modules to remain in an inoperable state until the reference voltage stabilizes at substantially the second voltage level; and control at least a subset of the one or more digital modules or at least a subset of the one or more analog modules to remain in an inoperable state until the regulated voltage level stabilizes at substantially the second voltage level.