Wideband low dropout voltage regulator
US7675273B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2007 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Feb 15, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/575
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus for regulating a supply voltage to an integrated circuit is disclosed. The method and apparatus provides good power supply noise rejection characteristics over a wide bandwidth as well as low dropout voltage. In the disclosed methods and apparatus, native NMOS source followers may be stacked and coupled to a supply rail to supply a regulated voltage to a load. The gates of the native NMOS source followers may be coupled to the outputs of internal regulators. The internal regulators may also contain stacked NMOS source followers. In an embodiment, the internal regulators may be supplied by a high voltage source, while native NMOS source followers may be supplied by a low voltage source. In another embodiment, lo-pass filters may filter the signal from the internal regulators to the NMOS source followers. In yet another embodiment, the gates of the source followers may be coupled to the sources of the transistors with the internal regulators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.