Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-02-01
2005-02-01
Tse, Young T. (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S139000, C375S149000, C327S148000, C327S157000
Reexamination Certificate
active
06850554
ABSTRACT:
A circuit and method for controlling a spread spectrum transition are presented comprising a first circuit and a second circuit. The first circuit may be configured to generate a clock signal in response to (i) a reference signal, (ii) a sequence of spread spectrum ROM codes, and (iii) a command signal. The second circuit may be configured to synchronize the command signal to a feedback signal. The sequence of spread spectrum ROM codes may be generated according to a predetermined mathematical formula and optimized in accordance with predetermined criteria.
REFERENCES:
patent: 4578649 (1986-03-01), Shupe
patent: 5148447 (1992-09-01), Ito
patent: 5204877 (1993-04-01), Endo et al.
patent: 5226058 (1993-07-01), Anderson et al.
patent: 5416434 (1995-05-01), Kootstra et al.
patent: 5488627 (1996-01-01), Hardin et al.
patent: 5491458 (1996-02-01), McCune, Jr. et al.
patent: 5631920 (1997-05-01), Hardin
patent: 6292507 (2001-09-01), Hardin et al.
patent: 6377646 (2002-04-01), Sha
patent: 6590949 (2003-07-01), Marten et al.
patent: 0655829 (1995-05-01), None
patent: 0739089 (1996-10-01), None
Young et al., “A PLL clock generator with 5 to 10 MHz of lock range for microprocessors”, Solid-State Circuits, IEEE Journal of, vol.:27, Issue:11, Nov. 1992 pp.:1599-1607.*
Hardin et al., “Design considerations of phase-locked loop systems for spread spectrum clock generation compatibility”, Electromagnetic Compatibility, 1997. IEEE 1997 International Symposium on, Aug. 18-22, 1997 pp.:302-307.*
Circuit and Method For Linear Control of a Spread Spectrum Transition, US. Appl. No. 09/436,155, filed Nov. 9, 1999.
Chen Albert
Chen Kuang-Yu
Sha I-Teh
Chang Edith
Cypress Semiconductor Corp.
Maiorana PC Christopher P.
Tse Young T.
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