Frequency synthesizer with hit-less transitions between frequency- and phase-locked modes
US8786341B1 · kind B1 · utility
21Cited by
1References
20Claims
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Key dates
| Filing date | Mar 15, 2013 |
| Grant date | Jul 22, 2014 |
| Priority date | — |
| Expiry date | Mar 15, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/1075
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital frequency synthesizer provides absolute phase lock and shorter settling time through the use of a digital filter with a phase and frequency path. Control logic control disables the frequency path during the frequency acquisition and sets a wide bandwidth. After frequency acquisition, a counter with digital phase information is reset using the input clock signal to bring the output phase closer to lock with the input signal and the control logic enables the phase path in the digital loop filter to achieve phase lock with a narrower bandwidth than the initial bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.