Adaptive frequency detector of phase locked loop
US7369000B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2005 |
| Grant date | May 6, 2008 |
| Priority date | — |
| Expiry date | Mar 2, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/113
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An adaptive frequency detector used in a phase locked loop for detecting a frequency difference between an input signal and an output clock generated from an oscillator of the phase locked loop includes: a frequency comparator for generating an up signal or a down signal according to the frequency difference between the input signal and the output clock; and a pulse controller coupled to the frequency comparator for generating a charge signal based on the up signal or generating a discharge signal based on the down signal. The pulse controller dynamically adjusts the pulse width of the charge signal or the pulse width of the discharge signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.