VCO tuning curve compensated charge pump current synthesizer
US6680653B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2000 |
| Grant date | Jan 20, 2004 |
| Priority date | — |
| Expiry date | Dec 20, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0898
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system provided for controlling an output frequency of a voltage controlled oscillator relative to a reference frequency. A method includes the steps of detecting a phase error between a divided output of the voltage controlled oscillator and the reference frequency, pumping a frequency control input of the voltage controlled oscillator with the phase error and adjusting a pumping gain based upon a magnitude of the frequency control input to the voltage controlled oscillator.This apparatus includes a phase detector adapted to detect the phase error between the divided output of the voltage controlled oscilator and the reference frequency and a charge pump adapted to pump the frequency control input of the voltage controlled oscillator with the phase error. The apparatus also includes a gain controller adapted to adjust the pumping gain based upon the magnitude of the frequency control input to the voltage controlled oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.