Wide bandwidth phase locked loop circuit with sliding window averager
US4963839A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Sep 1, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/093
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Broadband, single and multiphase phase lock loop circuits utilize a sliding window averager to remove the second harmonic and other ac components from a phase error signal which is the product of a sinusoidal or square wave source signal and a corresponding reference signal synthesized from a variable frequency signal produced by a voltage controlled oscillator as a function of the integratal of the phase error signal. The sliding window averager maintains a running average of a number of most recent samples of the phase error signal taken over a selected interval which is preferably one-half cycle of the source signal. Also preferably, the sliding window averager is clocked by the variable frequency signal generated by the voltage controlled oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.