Synchronous follow-up apparatus and synchronous follow-up method
US7457979B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 2005 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Oct 19, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A synchronous follow-up apparatus includes a PLL portion that outputs a first clock signal, and a control loop portion. The control loop portion includes a reference frequency signal generating portion that outputs a reference frequency signal, a clock signal generating portion that generates a second clock signal having the same frequency as a frequency of the first clock signal based on the reference frequency signal generated by the reference frequency signal generating portion, and a frequency control signal generating portion that generates a frequency control signal to change the frequency of the second clock signal based on a frequency difference between the first clock signal and the second clock signal that occurs after a predetermined time and outputs the frequency control signal to the clock signal generating portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.