Multi-mode VCO for direct FM systems
US7974374B2 · kind B2 · utility
1Cited by
103References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 2007 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Apr 23, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/0958
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Systems for multi-mode phase modulation are disclosed. Systems provide for direct modulation of a multi-mode voltage controlled oscillator (VCO). A fractional-N counter may be used in a phase-locked loop (PLL) to synthesize a radio frequency carrier signal. The multi-mode VCO may be characterized by a first frequency gain during operation in a first mode and by a second frequency gain during operation in a second mode where signals controlling the first and second operating modes are provided by a control circuit. The control circuit may include a switch to provide control signals to the VCO.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.