Spread spectrum clock generator with controlled delay elements

Details Spread spectrum clock generator with controlled delay elements Spread spectrum clock generator with controlled delay elements

2008-03-17

2010-06-22

Tse, Young T. (Department: 2611)

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

C713S401000

Reexamination Certificate

active

07742552

ABSTRACT:
A programmable spread spectrum clock generator (SSCG) reduces electromagnetic interference by spreading the frequency bandwidth of an output signal. The rate at which the frequency of the output signal changes, as well as other aspects of the output signal, are software programmable. The programmable SSCG receives a periodic signal whose cycles have substantially identical periods and outputs the output signal whose cycles have periods that vary smoothly over a plurality of cycles of the periodic signal. The programmable SSCG generates a control signal using the periodic signal. The programmable SSCG includes a variable delay element that generates the output signal by delaying the periods of the periodic signal based on the magnitude of the control signal. The output signal is generated without using a phase locked loop. Moreover, successive cycles of the output signal rarely have identical periods.

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