Delay locked loop design with switch for loop filter capacitance leakage current control
US6597219B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2002 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Jul 19, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0816
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A delay locked loop design that uses a switch operatively connected to a loop filter capacitor to control a leakage current of the loop filter capacitor is provided. By positioning a switch in series with the loop filter capacitor, the leakage current of the loop filter capacitor may be controlled by switching the switch ‘on’ when a charge pump of the delay locked loop is ‘on’ and switching the switch ‘off’ when the charge pump is ‘off,’ thereby cumulatively reducing the leakage current of the loop filter capacitor throughput the operation of the delay locked loop. Control and reduction of the loop filter capacitor leakage current leads to more reliable and stable delay locked loop behavior.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.