Fast phase-lock frequency synthesizer with variable sampling efficiency
US4634998A · kind A · utility
113Cited by
7References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1985 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Jul 17, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/1077
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase-locked frequency synthesizer (10) having a voltage controlled oscillator (40), a divider circuit (60), and a sample-and-hold phase detector (30, 80, 90, 100, 110) which includes sample-and-hold circuitry (FIG. 6) having variable efficiency. Specifically, the sample-and-hold circuitry provides a sampling pulse of variable width which is controlled to be wider during acquisition and narrower during steady-state operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.