Low noise frequency synthesizer

Details Low noise frequency synthesizer Low noise frequency synthesizer

2007-06-04

2009-08-25

Tran, Anh Q (Department: 2819)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

C331S016000, C331S025000

Reexamination Certificate

active

07579916

ABSTRACT:
A frequency synthesizer comprising an input large step frequency source suitable for generating a large step frequency, a variable frequency source suitable for generating a small step frequency, a first phase detector, a first voltage controlled oscillator, a first mixer, a second phase detector, a second voltage controlled oscillator, a second mixer, at least two frequency divide circuits and a feedback loop is disclosed. The input large step frequency source and the variable frequency source are suitable for combining to form mixed frequency, second voltage controlled oscillator is in the feedback loop and the feedback loop is suitable for receiving the combination of the large step frequency and the variable frequency.

REFERENCES:
patent: 3588732 (1971-06-01), Tollefson
patent: 4839603 (1989-06-01), Mower et al.
patent: 4912432 (1990-03-01), Galani et al.

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