Broadband frequency synthesizer for suppressing parasitic...

Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation

Reexamination Certificate

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Details

C331S17700V, C331S179000, C331S034000

Reexamination Certificate

active

07928805

ABSTRACT:
A broadband frequency synthesizer including a VCO for supplying a high frequency output signal, a dual mode divider circuit, a means for selecting a division mode of the divider circuit, a phase detector and a low pass filter. The divider circuit divides the frequency of the output signal by a first division facto N1in a first mode M1or by a second factor N2different from the first factor N1in a second mode M2to provide the divided frequency signal (Fdiv). The selection means selects by determined time period the first or second division mode of the divider circuit as a function of the programmed frequency of the output signal in the frequency band defined by the first and second division factors N1and N2.If this frequency is dose to the center of the frequency band, the dual mode divider divides the output signal frequency by a third factor N3in a first mode M1or by a fourth division factor N4.different from N3,in a second mode M2according to the programming of the selection means.

REFERENCES:
patent: 7116747 (2006-10-01), Casagrande
patent: 2003/0109237 (2003-06-01), Chien et al.
patent: 2003/0227301 (2003-12-01), Lee
patent: 2004/0239434 (2004-12-01), Casagrande
patent: 2 267 496 (1999-09-01), None
patent: 1 300 950 (2003-04-01), None
patent: 2005-033581 (2005-02-01), None
International Search Report issued in corresponding application No. PCT/EP2007/060505, completed Jan. 17, 2008 and mailed Feb. 20, 2008.

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