公开(公告)号：US08971423B1

公开(公告)日：2015-03-03

申请号：US12721432

申请日：2010-03-10

Applicant: Wei Fu ,  Hongming An ,  Bin Nie ,  Jun Ye

Inventor： Wei Fu ,  Hongming An ,  Bin Nie ,  Jun Ye

IPC: H04K1/10 ,  H03D3/24 ,  H03K5/19

CPC classification number: H03L7/0807 ,  H03L7/0895 ,  H03L7/093 ,  H03L7/113

Abstract: In one example, a system includes an oscillator adapted to provide an oscillator signal, a frequency divider adapted to divide the oscillator signal to provide a divided oscillator signal, and a phase-frequency detector adapted to provide phase-frequency detection signals in response to a reference clock signal and the divided oscillator signal. The system also includes a charge pump adapted to provide first output signals in response to the phase-frequency detection signals, a phase detector adapted provide second output signals in response to an incoming data signal and the oscillator signal, and one or more switches adapted to pass the first output signals during a frequency acquisition mode and pass the second output signals during a phase lock mode. The system also includes an active filter adapted to filter the passed first or second output signals. The oscillator is adapted to adjust a frequency of the oscillator signal in response to the filtered first or second output signals.

Abstract translation: 在一个示例中，系统包括适于提供振荡器信号的振荡器，适于分频振荡器信号以提供分频振荡器信号的分频器，以及相位频率检测器，其适于响应于 参考时钟信号和分频振荡器信号。 该系统还包括适于响应于相位频率检测信号提供第一输出信号的电荷泵，相位检测器适于响应输入数据信号和振荡器信号提供第二输出信号，以及一个或多个开关，适于 在频率获取模式期间传递第一输出信号，并在锁相模式期间传递第二输出信号。 该系统还包括适用于过滤所传送的第一或第二输出信号的有源滤波器。 振荡器适于响应于滤波的第一或第二输出信号来调整振荡器信号的频率。