Method and system for a lock detector for a phase-locked loop
US7157978B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Apr 8, 2005 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Jul 26, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S331/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A lock detector receives a feedback signal from a phase-locked loop and a reference signal. The lock detector includes a first generator for receiving the reference and feedback signals, and for sampling the feedback signal with the reference signal. A second generator is coupled to the first generator for incrementing a count when the feedback signal is at different polarities at consecutive edges of the reference signal. An output line, for asserting a phase lock when the count reaches a defined value, is coupled to the second generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.