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    • 21. 发明授权
    • Delay locked loop
    • 延迟锁定环路
    • US08368446B2
    • 2013-02-05
    • US13190841
    • 2011-07-26
    • Jae-Min JangYong-Ju KimHae-Rang Choi
    • Jae-Min JangYong-Ju KimHae-Rang Choi
    • H03L7/06
    • H03L7/0814H03L7/0816H03L7/095H03L2207/14
    • A delay locked loop includes a delay unit delaying an input clock to generate an output clock, a replica delay unit delaying the output clock to generate a feedback clock, a phase comparing unit outputting a phase signal having a first or second value according to whether the phase of the feedback clock leads the phase of the input clock, a filtering unit generates a filtering signal in response to the phase signal and updates the filtering signal when a difference of count numbers of the phase signal having the first value and the second value is substantially equal to a filtering depth, a locking unit generates a locking signal in response to the filtering signal, and a control unit adjusts a delay value in response to the filtering signal and maintains the delay value when the locking signal is activated.
    • 延迟锁定环包括延迟单元延迟输入时钟以产生输出时钟,复制延迟单元延迟输出时钟以产生反馈时钟;相位比较单元,根据是否输出第一或第二值输出具有第一或第二值的相位信号 反馈时钟的相位导致输入时钟的相位,滤波单元响应于相位信号产生滤波信号,并且当具有第一值和第二值的相位信号的计数数的差为 基本上等于滤波深度,锁定单元响应于滤波信号产生锁定信号,并且控制单元响应于滤波信号调整延迟值,并且当锁定信号被激活时维持延迟值。
    • 23. 发明申请
    • DELAY LOCKED LOOP
    • 延迟锁定环
    • US20120194239A1
    • 2012-08-02
    • US13111568
    • 2011-05-19
    • Jae-Min JANGYong-Ju KIMHae-Rang CHOI
    • Jae-Min JANGYong-Ju KIMHae-Rang CHOI
    • H03L7/06
    • H03L7/087G11C7/222H03L7/0814H03L7/0816
    • A DLL circuit includes a common delay line configured to generate a delay locked clock by selectively delaying a source clock by one or more unit delays in response to a first delay control code or a second delay control code, a clock cycle detector configured to compare a phase of the source clock with a phase of the delay locked clock in a cycle detection mode and generate the first delay control code corresponding to a delay amount of a cycle of the source clock based on a result of comparing the phases of the source and delay locked clocks, a feedback delay configured to delay the delay locked clock and output a feedback clock, and a delay amount controller configured to compare the phase of the source clock with a phase of the feedback clock in a delay locking mode and change the second delay control code based on a result of comparing the source and feedback clocks.
    • DLL电路包括公共延迟线,其配置为通过响应于第一延迟控制代码或第二延迟控制代码选择性地将源时钟延迟一个或多个单位延迟来产生延迟锁定时钟,时钟周期检测器被配置为 源时钟的相位以延迟锁定时钟的相位处于周期检测模式,并且基于比较源极和延迟的相位的结果生成与源时钟的周期的延迟量相对应的第一延迟控制代码 锁定时钟,被配置为延迟延迟锁定时钟并输出反馈时钟的反馈延迟,以及延迟量控制器,被配置为将延迟锁定模式中的源时钟的相位与反馈时钟的相位进行比较,并且改变第二延迟 基于比较源和反馈时钟的结果的控制代码。