Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

2008-07-15

2010-02-23

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S147000

Reexamination Certificate

active

07667508

ABSTRACT:
A circuit for receiving an input signal and generating an output signal, the input signal having a first frequency, the output signal having a second frequency. The circuit comprises a forward branch for generating the output signal and a return branch for feeding back the output signal. The return branch comprises a frequency divider for receiving the output signal, for dividing the frequency of the output signal by a factor, and for outputting a modified output signal. The forward branch comprises a detector for comparing the input signal and the modified output signal and outputting a comparison signal indicative of the comparison; a word-length reduction circuit for reducing the number of bits of the comparison signal, thereby generating a reduced-length comparison signal; a digital-to-analog converter for converting the reduced-length comparison signal to analog, thereby generating an analog signal; and an oscillator, controlled by said analog signal. By reducing the word length of the input to the digital-to-analog converter, the digital-to-analog converter may be greatly simplified.

REFERENCES:
patent: 5638010 (1997-06-01), Adams
patent: 6198353 (2001-03-01), Janesch et al.
patent: 6825729 (2004-11-01), Splett
patent: 7355462 (2008-04-01), Wong et al.
patent: 2004/0233086 (2004-11-01), Kiss et al.
patent: WO 03/079553 (2003-09-01), None

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