Self-sweeping autolock PLL
US6704382B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1998 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Jul 10, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/033
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved phase-lock loop circuit comprising a phase detector, a loop filter, and a voltage controlled oscillator. The phase detector samples the phase-lock loop input signal at various points in a cycle of the phase-lock loop output signal and outputs a signal representative of the point of the phase-lock loop output cycle at which a logic state transition of the input signal is detected. In addition, a self-sweeping autolock circuit interacts with the loop filter in such a manner that the self-sweeping autolock circuit commands the loop filter to sweep its output signal when phase-lock is absent and the loop filter halts the sweep of its output signal when phase-lock is acquired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.