Frequency calibration circuit for automatically calibrating a frequency generated by an oscillator and method thereof
US8359489B2 · kind B2 · utility
3Cited by
1References
13Claims
0Family size
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Key dates
| Filing date | Oct 18, 2010 |
| Grant date | Jan 22, 2013 |
| Priority date | — |
| Expiry date | May 7, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A serial interface engine generates a series of digital data according to a pair of differential signals received from a high-speed Universal Serial Bus host and/or a full-speed universal serial bus host. Then, a packet identification (PID) unit identifies a packet identification of a start of each frame and a first period between two consecutive packet identifications according to the series of digital data. A count comparator is used for generating a calibration signal to calibrate an output frequency of an oscillator according to the first period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.