Spread spectrum clock generator with low jitter

Details Spread spectrum clock generator with low jitter Spread spectrum clock generator with low jitter

2008-06-06

2009-12-29

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S115000, C327S117000

Reexamination Certificate

active

07639053

ABSTRACT:
A spread spectrum clock generator includes: a phase frequency detector, for generating a phase difference signal according to a frequency divided signal and a reference signal with a reference frequency; a charge pump, for receiving the phase difference signal and generating an output current according to the phase difference signal; a loop filter, for receiving the output current and converting the output current to a voltage-controlled signal; a voltage-controlled oscillator, for receiving the voltage-controlled signal and generating a plurality of voltage-controlled output signals, wherein the plurality of voltage-controlled signals have a specific phase difference and a same voltage-controlled frequency; a frequency dividing unit, for receiving the plurality of voltage-controlled output signal and generating the frequency divided signal; and a delta-sigma modulator, for controlling the frequency dividing unit to have an equivalent divided value of (N+b)S+(N−a)(P−S) through receiving the frequency divided signal and a control word; wherein N, P, and S are integers, and a, b are fractional numbers, and S can be adjusted by the delta-sigma modulator.

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