SPREAD SPECTRUM CLOCK GENERATOR AND METHOD FOR GENERATING SPREAD SPECTRUM CLOCK SIGNAL
First Claim
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1. A spread spectrum clock generator, comprising:
- a random walk modulator for generating a modulating signal according to a random walk model; and
a phase-locked loop system, in communication with the random walk modulator, for receiving the modulating signal and generating a clock signal with spread spectrum in response to the modulating signal.
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Abstract
A spread spectrum clock generator for generating a spread spectrum clock signal is provided. The spread spectrum clock generator includes a phase-locked loop system and a random walk modulator. The random walk modulator generates a modulating signal according to a random walk model. Then, the phase-locked loop system generates a clock signal with spread spectrum in response to the modulating signal. A method for generating the spread spectrum clock signal using the spread spectrum clock generator is also provided.
9 Citations
20 Claims
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1. A spread spectrum clock generator, comprising:
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a random walk modulator for generating a modulating signal according to a random walk model; and a phase-locked loop system, in communication with the random walk modulator, for receiving the modulating signal and generating a clock signal with spread spectrum in response to the modulating signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A spread spectrum clock generator, comprising:
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a phase-frequency detector for receiving and comparing a reference clock and a feedback signal, and generating a control signal according a phase difference between the reference clock and the feedback signal; a charge pump, in communication with the phase-frequency detector, for generating a control voltage in response to the control signal from the phase-frequency detector; a voltage-controlled oscillator, in communication with the charge pump, for generating a clock signal according to the control voltage from the charge pump; a frequency divider, in communication with the voltage-controlled oscillator and the phase-frequency detector, for receiving the clock signal from the voltage-controlled oscillator, and generating the feedback signal to the phase-frequency detector by down-converting the clock signal with a frequency divisor; and a random walk modulator, in communication with the frequency divider, for generating a modulating signal according to a random walk model to adjust the frequency divisor. - View Dependent Claims (12)
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13. A method for generating a spread spectrum clock signal by a clock generator, the method comprising steps of:
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generating a modulating signal according to a random walk model; sending the modulating signal to a phase-locked loop system of the clock generator; and the phase-locked loop system generating a clock signal with spread spectrum in response to the modulating signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification