Phased locked loop with multiple voltage controlled oscillators
US9467092B1 · kind B1 · utility
7Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2015 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Nov 16, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/0315
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phased locked loop (PLL) incorporates multiple voltage controlled oscillators including one that operates in a lower frequency range than an operational VCO used by the PLL. A VCO selection circuit allows the system to select from one or more alternate VCOs. A ring oscillator VCO may be used as the alternate VCO for a PLL that uses a LC VCO for the operational VCO. While the ring oscillator VCO provides lower performance, the ring oscillator VCO allows the system with the PLL to be run at a lower speed for testing, debugging or characterization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.