Low-noise flexible frequency clock generation from two fixed-frequency references
US9231600B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2015 |
| Grant date | Jan 5, 2016 |
| Priority date | — |
| Expiry date | Jul 3, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A number of methods and clock generator units are disclosed to produce low Phase Noise clocks for use in Radio Frequency systems. The methods and clock generator units all use two reference clocks: a frequency-accurate reference that has comparatively high Phase Noise, and a frequency-inaccurate reference such as that from a BAW or MEMS clock source that has comparatively low Phase Noise. By combining multiple Phase-Locked Loops and a mixer, it is possible to produce flexible output frequencies whose frequency accuracy is derived from the first reference clock but whose Phase Noise level is derived from the second reference clock, all in a readily-integrated and relatively low-cost system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.