Frequency-locking device and frequency-locking method thereof
US7633348B2 · kind B2 · utility
3Cited by
6References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2007 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Jun 20, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/033
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A frequency-locking device including a digitally-controlled oscillator (DCO) and a comparing unit is disclosed. The DCO is used for generating an output frequency signal. The comparing unit receives a Keep Alive signal from a universal serial bus (USB) and the output frequency signal, and compares the Keep Alive signal with the output frequency signal to generate a calibration signal. Then, the DCO adjusts the frequency of the output frequency signal according to the calibration signal to meet the USB specification for data communication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.