Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

2005-01-18

2005-01-18

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

C341S200000

Reexamination Certificate

active

06844758

ABSTRACT:
The present invention provides a frequency synthesizer comprising a noise-shaped quantizer and a divider. The noise-shaped quantizer is utilized for quantizing a period control word to a time-varying value. The divider is used for generating an output signal by of dividing a reference signal by the time-varying value. The output signal is fed back to the noise-shaped quantizer so that the noise-shaped quantizer generates the time-varying value in response to the feedback output signal. Accordingly, the frequency synthesizer of the present invention can provide a very precise frequency synthesizer featuring very accurate long-term phase, frequency, and jitter stability.

REFERENCES:
patent: 4862173 (1989-08-01), Nishitani
patent: 5157760 (1992-10-01), Akagiri
patent: 5436665 (1995-07-01), Ueno et al.
patent: 5896101 (1999-04-01), Melanson

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