Digital phase lock detector and low-pass filter selector
US5956379A · kind A · utility
13Cited by
3References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 11, 1997 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Jun 11, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/1075
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital phase lock detector and phase lock loop filter selector circuit implemented in hardware that dynamically selects a phase lock loop filter of appropriate bandwidth for the instant phase error condition. Phase error is primarily determined by an XOR gate receiving the PLL reference signal and the oscillator feedback signal coupled to a counter that is clocked by a high frequency signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.