Phase lock control system for a voltage controlled oscillator
US7538620B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2007 |
| Grant date | May 26, 2009 |
| Priority date | — |
| Expiry date | Dec 25, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/095
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase lock control system is presented for controlling a voltage controlled oscillator. The system includes a voltage controlled oscillator that produces a frequency signal exhibiting an output frequency that varies dependent upon the value of a control voltage applied thereto. A frequency deviation determining system employs a counter intermittently triggered ON for a fixed time by successive timing pulses received from a reference source and a comparator that determines any frequency deviation of the output frequency relative to a preset frequency. An error filter monitors the comparator for any frequency deviation for a plurality of samples of the frequency deviation determinations. A controller varies the control voltage to vary the output frequency in a direction to eliminate any frequency deviation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.