Fast settling charge pump
US6466069B1 · kind B1 · utility
21Cited by
30References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2000 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Nov 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/1974
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
This invention provides a charge pump biasing circuit that varies the bias when the phase lock loop changes frequency to improve the settling time of the phase lock loop. During a frequency change, the charge pump output current taper off as the phase lock loop approaches the desired frequency. The charge pump biasing circuit allows the phase lock loop to change frequencies faster and minimizes spurious sideband noise once the loop has settled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.