Frequency synthesizer applied to frequency hopping system

Details Frequency synthesizer applied to frequency hopping system Frequency synthesizer applied to frequency hopping system

2007-07-06

2009-06-09

Hiteshew, Felisa C (Department: 1792)

Pulse or digital communications

Spread spectrum

Frequency hopping

C331S004000, C375S260000

Reexamination Certificate

active

07545847

ABSTRACT:
A frequency synthesizer applied to a frequency hopping system includes a voltage controlled oscillator (VCO), a phase lock loop (PLL) system, a second frequency divider, a first SSB mixer, a second SSB mixer, and a multiplexer. The VCO generates an oscillating frequency. The PLL system includes a first frequency divider and divides the oscillating frequency by 10 to generate a first dividing signal. The second frequency divider divides the oscillating frequency by 2 to generate a second dividing signal and further divides the second dividing signal by 2 to generate a third dividing signal. The first SSB mixer mixes frequencies of the second and third dividing signals to generate a first mixing signal. The second SSB mixer mixes frequencies of the first mixing signal and the first dividing signal to generate a second mixing signal. The Multiplexer determines to output the first mixing signal or the second mixing signal.

REFERENCES:
patent: 7012471 (2006-03-01), Lyden et al.
patent: 7352251 (2008-04-01), Krishnan et al.
patent: 7499684 (2009-03-01), Cavin

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