Voltage reference circuit with fast enable and disable capabilities
US8143869B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2009 |
| Grant date | Mar 27, 2012 |
| Priority date | — |
| Expiry date | Oct 18, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/56
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A circuit for providing an output voltage substantially equal to a reference voltage includes: a low drop-out (LDO) regulator coupled to the reference voltage for producing the output voltage at an output terminal; a reference current source having a first end and a second end for providing a predetermined reference current; a first transistor having a first terminal coupled to a first supply voltage, a second terminal, and a control terminal coupled to the second terminal of the first transistor; a first switch for selectively coupling the second terminal of the first transistor to the first end of the reference current source according to a first control signal; and a second transistor having a first terminal coupled to the first supply voltage, a control terminal coupled to the control terminal of the first transistor, and a second terminal coupled to the output terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.