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US 7,804,284 B1Granted
PSRR regulator with output powered reference
AssigneeNational Semiconductor Corporation
InventorKern Wai Wong
Life of this patent
Estimating the term…
Abstract
The invention relates to a regulator with a reference generator circuit (e.g., a band-gap reference) and a reference generator power selector. The reference generator power selector selectively powers the reference generator circuit from an input power signal during start-up and from a regulated power signal during steady-state operation. The reference generator power selector may also select from multiple regulated power signals during steady-state operation.
Claims20
A circuit for regulating power, comprising:
- a regulator that is arranged to receive an input power signal, to receive a reference signal, and to provide a regulated power signal;
- and is further arranged such that the regulated power signal is provided based, at least in part, on the reference signal;
- a reference generator circuit that is arranged to provide the reference signal such that the reference signal is maintained at a substantially constant value, wherein the reference generator circuit includes a band-gap reference circuit;
- and
- a reference generator power selector that is arranged to selectively power the reference generator circuit from one of a plurality of power signals, wherein the plurality of power signals includes the input power signal and the regulated power signal.
2 more elements
A circuit for regulating power, comprising:
- a regulator controller that is arranged to receive an input power signal, to receive a reference signal, and to receive a regulated power signal;
- and is further arranged to control the regulated power signal based, at least in part, on the reference signal;
- a reference generator circuit that is arranged to provide the reference signal such that the reference signal is maintained at a substantially constant value;
- and
- a reference generator power selector that is arranged to selectively power the reference generator circuit from one of a plurality of power signals, wherein the plurality of power signals includes the input power signal and the regulated power signal.
2 more elements
A method for regulating power, comprising:
- receiving an input power signal;
- employing a reference generator circuit to provide a reference signal, wherein the reference signal is maintained at a substantially constant value;
- regulating a regulated power signal based, at least in part, on the input power signal and the reference signal;
- powering, during a first operating condition, the reference generator circuit from the input power signal;
- and
- powering, during a second operating condition, the reference generator circuit from the regulated power signal.
3 more elements
Dependencies are inferred from the claim text.