Frequency tracing circuit and method thereof
US8824615B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2013 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Mar 14, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0331
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A frequency tracking circuit is disclosed. The frequency tracking circuit includes an edge selector, a phase-frequency processor and a digital controlled oscillator. The edge selector receives a data signal and feedback clock signal and sequentially outputs a data edge signal and a feedback-clock-edge signal. The phase-frequency processor receives the data edge signal and the feedback-clock-edge signal and outputs a frequency adjusting digital signal after executing differential operation according to a first phase difference and a second phase difference. The digital controlled oscillator receives the frequency adjusting digital signal so as to adjust frequency of the feedback clock signal. The phase-frequency processor outputs a frequency tracking signal to the edge selector, wherein the edge selector utilizes the frequency tracking signal for acquiring the data edge signal and utilizes the data edge signal for acquiring the feedback-clock-edge signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.