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1. 发明申请

US20060068737A1 Sigma-delta based phase lock loop 有权
公开(公告)号：US20060068737A1
公开(公告)日：2006-03-30
申请号：US11227909
申请日：2005-09-16
申请人： Yido Koo , Youngho Ahn , Eunseok Song , Jeong-Woo Lee , Joonbae Park , Kyeongho Lee
发明人： Yido Koo , Youngho Ahn , Eunseok Song , Jeong-Woo Lee , Joonbae Park , Kyeongho Lee
IPC分类号： H04B1/40 , H04B7/00 , H03D3/24 , H04B1/06
CPC分类号： H03L7/0895 , H03L7/1976
摘要： A sigma-delta based phase lock loop device is provided that includes a phase frequency detector (PFD), a charge pump and a voltage controlled oscillator. The PFD to receive a reference signal and a feedback signal and to output signals based on a comparison of the reference signal and the feedback signal. The charge pump to output a charge based on the output signals from the PFD. The charge pump including a first current source to apply a fixed amount of current and a second current source to apply a variable amount of current. The voltage controlled oscillator to output a clock signal based on the received charge from the charge pump.

2. 发明授权

US07535977B2 Sigma-delta based phase lock loop 有权
标题翻译：基于Sigma-delta的锁相环
公开(公告)号：US07535977B2
公开(公告)日：2009-05-19
申请号：US11227909
申请日：2005-09-16
申请人： Yido Koo , Youngho Ahn , Eunseok Song , Jeong-Woo Lee , Joonbae Park , Kyeongho Lee
发明人： Yido Koo , Youngho Ahn , Eunseok Song , Jeong-Woo Lee , Joonbae Park , Kyeongho Lee
IPC分类号： H03D3/18
CPC分类号： H03L7/0895 , H03L7/1976
摘要： A sigma-delta based phase lock loop device is provided that includes a phase frequency detector (PFD), a charge pump and a voltage controlled oscillator. The PFD to receive a reference signal and a feedback signal and to output signals based on a comparison of the reference signal and the feedback signal. The charge pump to output a charge based on the output signals from the PFD. The charge pump including a first current source to apply a fixed amount of current and a second current source to apply a variable amount of current. The voltage controlled oscillator to output a clock signal based on the received charge from the charge pump.
摘要翻译：提供了一种基于Σ-Δ的锁相环装置，其包括相位频率检测器（PFD），电荷泵和压控振荡器。 PFD接收参考信号和反馈信号，并且基于参考信号和反馈信号的比较来输出信号。电荷泵根据PFD的输出信号输出电荷。电荷泵包括施加固定电流量的第一电流源和第二电流源以施加可变量的电流。压控振荡器根据来自电荷泵的接收电荷输出时钟信号。

3. 发明授权

US06952125B2 System and method for suppressing noise in a phase-locked loop circuit 有权
标题翻译：用于抑制锁相环电路中的噪声的系统和方法
公开(公告)号：US06952125B2
公开(公告)日：2005-10-04
申请号：US10689986
申请日：2003-10-22
申请人： Youngho Ahn , Eunseok Song , Yido Koo , Jeong-Woo Lee , Joonbae Park , Kyeongho Lee
发明人： Youngho Ahn , Eunseok Song , Yido Koo , Jeong-Woo Lee , Joonbae Park , Kyeongho Lee
IPC分类号： H03L7/197 , H03L7/06 , H03L7/08
CPC分类号： H03L7/1978
摘要： A system and method for improving the signal-to-noise ratio of a frequency generator suppresses phase noise and noise generated from mismatches in the internal generator circuits. This is accomplished using a modulation scheme which shifts spurious noise signals outside the loop bandwidth of the generator. When shifted in this manner, the noise signals maybe removed entirely or to any desired degree using, for example, a filter located along the signal path of the generator. In one embodiment, a Sigma-Delta modulator controls the value of a pulse-swallow frequency divider situated along a feedback path of a phase-locked loop to achieve a desired level of noise suppression. In another embodiment, a reference signal input into a phase-locked loop is modulated to effect noise suppression. In another embodiment, the foregoing forms of modulation are combined to accomplish the desired frequency shift. Through these modulation techniques, the signal-to-noise ratio of the frequency generator may be substantially improved while simultaneously achieving faster lock times.
摘要翻译：用于提高频率发生器的信噪比的系统和方法抑制由内部发生器电路中的失配产生的相位噪声和噪声。这是使用将发生器的环路带宽之外的杂散噪声信号移位的调制方案来实现的。当以这种方式移位时，噪声信号可以使用例如沿着发生器的信号路径定位的滤波器被完全去除或达到任何期望的程度。在一个实施例中，Σ-Δ调制器控制沿着锁相环路的反馈路径设置的脉冲吞咽分频器的值，以实现期望的噪声抑制水平。在另一个实施例中，输入到锁相环的参考信号被调制以实现噪声抑制。在另一个实施例中，组合上述形式的调制以实现期望的频移。通过这些调制技术，可以显着提高频率发生器的信噪比，同时实现更快的锁定时间。

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