Apparatus and method for controlling a phase-locked loop circuit
US6643499B1 · kind B1 · utility
11Cited by
5References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2000 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Sep 29, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/185
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A first and second phase-locked loop each having their frequency of operation under programmable control by changing the divider ratio. A single programming word contains the divider ratio for the first phase-locked loop and addressing bits which address a plurality of auxiliary registers for changing the divider ratio of the second phase-locked loop. In a cellular telephone, this allows the digital signal processor to change from receive to transmit mode or from one transmit mode or from one frequency to another utilizing a single command word.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.