Polar modulation with coarse and fine FM signals
US8095087B1 · kind B1 · utility
1Cited by
3References
28Claims
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Key dates
| Filing date | Dec 4, 2008 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Apr 10, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/20
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods for enhancement of performance in polar modulators are described. In one implementation, an FM signal component is divided into a coarse FM signal and a residue FM signal to be applied to a VCO for generation of a modulation signal. The coarse FM signal may be proportional to a threshold value when the FM signal exceeds the threshold, while the residue FM signal may be proportional to the difference between the FM signal and coarse FM signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.