RF integrated circuit comprising a frequency synthesizer not...

Details RF integrated circuit comprising a frequency synthesizer not... RF integrated circuit comprising a frequency synthesizer not...

2008-01-29

2008-01-29

Nguyen, Duc M. (Department: 2618)

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

C455S119000, C332S126000

Reexamination Certificate

active

07324788

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 F1adjustable 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 F2adjustable with a frequency step ΔF2and a main frequency synthesizer having a phase-locked loop bandwidth at least two times higher than the frequency step ΔF2of the auxiliary signal.

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patent: 7098754 (2006-08-01), Humphreys et al.
patent: WO 01/01562 (2001-01-01), None

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