High speed programmable charge-pump with low charge injection
US6717446B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 2002 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | Sep 16, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0898
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A high-speed charge-pump circuit includes an array of current source/sinks circuits that are selectable according to UP and DOWN control signals, and a programmable setting. Each current source/sink circuit includes a current source circuit and a current sink circuit. The current source and current sink circuits are coupled to cascode circuits to minimize charge feed-through at the output of the charge-pump circuit. Matched switching circuits are configured to absorb charges that are injected at a common node between the cascode circuits and the current source/sink circuits. A clamp adjustment circuit is arranged to provide clamp voltages to the common node when the current source/sink circuits are in an off mode such that switching speeds are improved. The reduced switching-times permit the charge-pump to operate at high speeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.