Faraday Technology Corporation

Ding-Shiuan Shen

Shen-Iuan Liu

Chia-Liang Lai

Shao-Ku Kao

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&#x2212;a)(P&#x2212;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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Chiayi, Taiwan

Ding-Shiuan Shen