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    • 1. 发明申请
    • 位相同期回路
    • 相位同步电路
    • WO2003061131A1
    • 2003-07-24
    • PCT/JP2002/007717
    • 2002-07-30
    • エヌティティエレクトロニクス株式会社竹尾 泰人豊田 修弘十林 正俊
    • 竹尾 泰人豊田 修弘十林 正俊
    • H03L7/087
    • H03L7/087H03L7/091H03L7/113H03L7/235H04L7/033
    • A phase synchronization circuit 40 for extracting a clock signal CK from a data signal D of random NRZ format and more specifically, a phase synchronization circuit 40 of double loop configuration including a phase comparison circuit 81 and a frequency comparison circuit 10. The phase synchronization circuit 40 can realize both of a wide capture range and high-quality clock signal extraction without requiring a reference clock signal. A clock signal Ca, another clock signal Cb having a phase delayed approximately by 1/4 as compared to the clock signal Ca, and a data signal D are input to a frequency comparison circuit 10 so as to output a logic value according to the magnitude relation between the frequencies of the aforementioned clock signals and the bit rate of the data signal D. Negative feedback of this logic value is performed by a frequency comparison loop F2. Thus, without requiring a reference clock signal, the frequency of the clock signal CK can be approximated to the bit rate of the data signal D and it is possible to realize a wide capture range and extraction of a high-quality clock signal.
    • 相位同步电路40,用于从随机NRZ格式的数据信号D提取时钟信号CK,更具体地说,是包括相位比较电路81和频率比较电路10的双回路配置的相位同步电路40.相位同步电路 40可以实现宽的捕获范围和高质量的时钟信号提取,而不需要参考时钟信号。 时钟信号Ca,与时钟信号Ca相比延迟大约1/4的相位的另一个时钟信号Cb和数据信号D被输入到频率比较电路10,以便根据幅度输出逻辑值 上述时钟信号的频率与数据信号D的比特率之间的关系。该逻辑值的负反馈由频率比较循环F2执行。 因此,不需要参考时钟信号,可以将时钟信号CK的频率近似为数据信号D的比特率,并且可以实现宽的捕获范围和提取高质量时钟信号。