Linear regulator with improved power supply rejection
US7688051B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2007 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Mar 16, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/56
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A linear regulator for outputting a regulated voltage with improved rejection of high frequency components in the power supply. The linear regulator includes an op-amp connected in a linear feedback loop to drive first and second current legs based on a voltage reference. An output driver includes a load capacitance across which the regulated voltage is output, and further includes a ratio-driven current mirror having a mirror ratio defined by relative sizes of active devices in the first and second current legs, as compared with relative sizes of active devices in the output driver. Because the output driver and its load capacitance are provided outside the linear feedback loop, large values for the load capacitance can be selected without destabilization of the feedback loop. Thus, the value of the load capacitance can be chosen at any value according to frequency rejection requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.