Pulse or digital communications – Spread spectrum
Reexamination Certificate
2005-04-05
2008-11-25
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Spread spectrum
C375S135000, C375S136000, C327S355000, C327S357000, C327S359000, C327S147000, C327S156000
Reexamination Certificate
active
07457346
ABSTRACT:
A spread-spectrum signal generator includes four differential input signal terminals, a differential output signal terminal, four interconnected mixer control subcircuits, a 4-input differential mixer, a first current source having a magnitude which sets the mixer's 3 db bandwidth, and a second current source having a magnitude which controls a frequency difference between the differential output signal the differential input signals. In a preferred embodiment, this frequency difference and the frequency of the differential output signal are modulated through the modulation of the second current source magnitude. The frequency of the modulation is equal to the frequency of the second current source modulation, and the magnitude of the output signal frequency modulation is proportional to the magnitude of the second current source modulation. A desirable result of said output signal frequency modulation is a spreading of the output signal's power over a prescribed band of frequencies and a corresponding reduction in power at any given frequency.
REFERENCES:
patent: 5886547 (1999-03-01), Durec et al.
patent: 6242965 (2001-06-01), Pickering et al.
patent: 6549074 (2003-04-01), Ugajin et al.
patent: 2004/0246047 (2004-12-01), Manku et al.
patent: 2005/0195032 (2005-09-01), Wang et al.
Briggs and Morgan P.A.
Liu Shuwang
Singh Hirdepal
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