This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMK00301: LMK00301SQX 的波形回沟问题

Part Number: LMK00301

我们在使用LMK00301SQX 这个clock buffer时,有个问题,请帮忙看看,谢谢

使用配置为:时钟频率为156.25MHz,输出电平为LVPECL,156.25MHz是由一个156.25MHz的有源振荡器提供给clock buffer。

1、使用电路如下:


 

测试波形如下:

 


2、使用电路如下:


测试波形如下:在上升沿和下降沿都有严重的回沟,请帮忙看看。


补充说明:

两个电路的测试点都在100ohm电阻位置:从clock buffer到150ohm线长为282mil,150ohm和10ohm电阻紧邻放置,10ohm到AC电容线长为2774.2mil,AC电容和100ohm紧邻放置,100ohm电阻到负载IC为228.9mil。(下图画的不是很好,)谢谢!!