公开(公告)号：US07639053B2

公开(公告)日：2009-12-29

申请号：US12134307

申请日：2008-06-06

申请人： Ding-Shiuan Shen ,  Shao-Ku Kao ,  Shen-Iuan Liu ,  Chia-Liang Lai

发明人： Ding-Shiuan Shen ,  Shao-Ku Kao ,  Shen-Iuan Liu ,  Chia-Liang Lai

IPC分类号： H03L7/06

CPC分类号： H03L7/1976 ,  H03L7/0996 ,  H03L7/193

摘要： 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.

摘要翻译： 扩频时钟发生器包括：相位频率检测器，用于根据分频信号和参考频率产生参考信号产生相位差信号; 电荷泵，用于接收相位差信号并根据相位差信号产生输出电流; 环路滤波器，用于接收输出电流并将输出电流转换成电压控制信号; 压控振荡器，用于接收所述压控信号并产生多个压控输出信号，其中所述多个压控信号具有特定相位差和相同的压控频率; 分频单元，用于接收多个压控输出信号并产生分频信号; 和Δ-Σ调制器，用于通过接收分频信号和控制字来控制分频单元具有（N + b）S +（N-a）（P-S）的等效分频值; 其中N，P和S是整数，a，b是分数，S可以由delta-Σ调制器调节。

公开(公告)号：US20080303566A1

公开(公告)日：2008-12-11

申请号：US12134307

申请日：2008-06-06

申请人： Ding-Shiuan Shen ,  Shao-Ku Kao ,  Shen-Iuan Liu ,  Chia-Liang Lai

发明人： Ding-Shiuan Shen ,  Shao-Ku Kao ,  Shen-Iuan Liu ,  Chia-Liang Lai

IPC分类号： H03L7/06

CPC分类号： H03L7/1976 ,  H03L7/0996 ,  H03L7/193

摘要： 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.

摘要翻译： 扩频时钟发生器包括：相位频率检测器，用于根据分频信号和参考频率产生参考信号产生相位差信号; 电荷泵，用于接收相位差信号并根据相位差信号产生输出电流; 环路滤波器，用于接收输出电流并将输出电流转换成电压控制信号; 压控振荡器，用于接收所述压控信号并产生多个压控输出信号，其中所述多个压控信号具有特定相位差和相同的压控频率; 分频单元，用于接收多个压控输出信号并产生分频信号; 和Δ-Σ调制器，用于通过接收分频信号和控制字来控制分频单元具有（N + b）S +（N-a）（P-S）的等效分频值; 其中N，P和S是整数，a，b是分数，S可以由delta-Σ调制器调节。