Spread spectrum clock signal generation system and method

Details Spread spectrum clock signal generation system and method Spread spectrum clock signal generation system and method

2004-10-15

2008-09-09

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Spread spectrum

C375S140000, C375S141000, C375S146000, C375S147000, C375S354000, C375S355000, C375S359000, C375S360000, C375S362000, C375S364000, C327S100000, C327S141000, C327S144000, C327S162000, C327S164000, C327S170000, C327S291000

Reexamination Certificate

active

07424046

ABSTRACT:
A system and method for generating a clock signal having spread spectrum modulation. The method involves generating a clock signal by generating edge positions for edges of the clock signal from a digital representation of a timing for each edge to impart spread spectrum modulation to the clock signal. A programmable modulator is provided that generates digital values representing edge positions for edges of a clock signal based on at least one of a time-varying period value and a time-varying duty-cycle value. The programmable modulator may comprise a first circuit, called a period modulation circuit, that generates a time-varying digital period value, and a second circuit, called a duty-cycle modulation circuit, that generates a time-varying digital duty-cycle value. The time-varying period values and time-varying duty cycle values are processed to produce a digital edge position value that specifies an edge position for a clock signal. The programmable modulator is coupled to an arbitrary waveform synthesizer that generates timing for edges of the clock signal based on the edge position values. A variety of modulations can be imposed on the clock signal using these techniques, including triangle wave modulation, near-triangle modulation, random and pseudo-random modulation.

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