Apparatus and methods for reducing noise in oscillating signals
US8446222B2 · kind B2 · utility
11Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 6, 2009 |
| Grant date | May 21, 2013 |
| Priority date | — |
| Expiry date | Oct 29, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus are described for reducing noise, such as phase noise, in an oscillating signal. The oscillating signal may be generated by a signal generator having a mechanical resonator, such as a crystal oscillator. A filter may be coupled to the output of the mechanical resonator and may have its center frequency adjusted using a phase-locked loop (PLL). A feedback signal from the filter to the signal generator may also be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.