Phase-locked loop having a multi-phase voltage controlled oscillator
US6181213A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1999 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Jun 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention provides a phase-locked loop having a multi-phase voltage controlled oscillator. The phase-locked loop comprises a divided-by-N counter, a divided-by-M counter, a phase frequency detector, a charge pump, a loop filter, a multi-phase voltage controlled oscillator, a switching unit, and a clock counter. It utilizes a multi-phase voltage controlled oscillator instead of a conventional voltage controlled oscillator and a switching unit is used to select the output signal from the multi-phase voltage controlled oscillator. The switching time of the switching unit is controlled by the clock counter to achieve the effect of frequency expansion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.