Phase locked loop frequency synthesizer

Details Phase locked loop frequency synthesizer Phase locked loop frequency synthesizer

2006-12-28

2009-12-15

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

Reexamination Certificate

active

07634041

ABSTRACT:
A dynamic carrying method to prevent saturation of a sigma-delta modulator of a phase locked loop frequency synthesizer. The phase locked loop frequency synthesizer using the dynamic carrying method comprises a forward portion receiving a reference frequency signal and a first frequency signal to generate an output carrier signal; a multi-modulus divider dividing the output carrier signal frequency to generate the first frequency signal; a dynamic carrying device receiving and separating transmitting data into a carrying part and a residue part when the transmitting data amplitude exceeds a threshold; a sigma-delta modulator receiving the residue part to generate a first modulus control signal; an auxiliary modulator receiving the carrying part to generate a second modulus control signal; and a first adder receiving the first modulus control signal, the second modulus control signal, and a third modulus control signal and outputting a modulus modulation signal to modulate the multi-modulus divider.

REFERENCES:
patent: 6008703 (1999-12-01), Perrott et al.
patent: 6011815 (2000-01-01), Eriksson et al.
patent: 6686803 (2004-02-01), Perrott et al.
patent: 2004/0081266 (2004-04-01), Adachi et al.
patent: 2005/0025276 (2005-02-01), Hammes et al.
patent: 2005/0213697 (2005-09-01), Adachi et al.

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