Method and circuit for producing a control voltage for a VCO
US7132897B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 2004 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Nov 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/187
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The control voltage for a VCO (voltage controlled oscillator) is produced in a phase locked loop which in turn is controlled by a computer (40) including an integrated analog circuit (42). First the oscillator control voltage is set to a predetermined value. Then, voltage varying steps are performed. For performing these steps, the circuit includes a main frequency divider and a reference frequency divider both functioning as counters. The beginnings of the counting of each divider are synchronized with each other. The oscillator control voltage is increased by a predetermined voltage difference or increment when the reference divider completes its counting period prior to the main divider completing its counting. The oscillator control voltage is decreased by a predetermined voltage difference or decrement when the main divider finishes its counting period prior to the reference divider finishing its count.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.