Method and apparatus for biasing circuits in response to power up conditions
US7663426B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2004 |
| Grant date | Feb 16, 2010 |
| Priority date | — |
| Expiry date | Dec 3, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00315
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power up biasing circuit for a split power supply based circuit includes a split power supply state sensing circuit that produces a pair of complimentary control signals indicating a presence or absence of a suitable biasing power supply voltage. A pseudo power supply voltage, based on a first power supply is selected by a selector circuit for acting as a biasing voltage for one or a plurality of components to be protected during initial power up where there is an absence of a second power supply voltage, based on the pair of complimentary control signals. Once the second power supply voltage has fully ramped up to steady state, the selector circuit selects the second power supply voltage as the biasing voltage for one or a plurality of component to be protected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.