RF integrated circuit comprising a frequency synthesizer not very sensitive to injection locking
US7324788B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2005 |
| Grant date | Jan 29, 2008 |
| Priority date | — |
| Expiry date | Jul 20, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/23
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an RF integrated circuit comprising a frequency synthesizer and a QAM modulator for modulating a baseband signal of frequency FBB, the frequency synthesizer supplying to the QAM modulator an output signal of frequency F1 adjustable with a frequency step ΔF1, for forming a carrier signal of the QAM modulator. According to the present invention, the frequency synthesizer is a Vernier effect frequency synthesizer comprising an auxiliary frequency synthesizer supplying an auxiliary signal of frequency F2 adjustable with a frequency step ΔF2 and a main frequency synthesizer having a phase-locked loop bandwidth at least two times higher than the frequency step ΔF2 of the auxiliary signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.