Reference voltage generator with fast start-up and low stand-by power
US5703475A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1996 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Jun 24, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/242
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A reference voltage generator includes a pull-up stage which pulls a reference voltage signal rapidly up toward 1/2Vcc at power-up. The pull-up stage is controlled by a controller which has a comparator and control voltage generator which are disabled after the pull-up operation is terminated so as to reduce stand-by current consumption. The controller includes a pair of NAND gates cross connected as an RS flip-flop to turn on the pull-up stage at power up. A boost signal allows the flip-flop to enable the comparator and control voltage generator after the power supply has stabilized. When the reference voltage signal reaches 1/2Vcc, the comparator sets the flip flop which turns off the pull-up stage and disables the comparator and control voltage generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.