Fractional N frequency synthesizer

Details Fractional N frequency synthesizer Fractional N frequency synthesizer

2005-03-29

2005-03-29

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S016000, C331S018000, C331S025000

Reexamination Certificate

active

06873213

ABSTRACT:
A frequency synthesizer (100) that may have reduced spurious noise caused by a voltage controlled oscillator (VCO) (4) output sneaking into an input side of a phase comparison circuit (1) has been disclosed. A beat frequency component that may be generated by mixing of a portion of a VCO output sneaking into an input side of a phase comparison circuit (1) through a reference signal (REF) or a comparison signal (SIG) may be shifted to a high frequency region by providing a modulator circuit (7) on a reference signal side or a comparison signal side. Thus, a low pass filter circuit (3) may provide attenuation to the spurious noise. In this way, spurious noise in the VCO output may be reduced.

REFERENCES:
patent: 5777521 (1998-07-01), Gillig et al.
patent: 5781044 (1998-07-01), Riley et al.
patent: 10-163860 (1998-06-01), None
Translation of indicated portions of Japanese Office Action of Dec. 18, 2003.

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