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The signal recovered by ADN2915 is bad

Question asked by Mr.all on Aug 20, 2015
Latest reply on Apr 12, 2016 by Dongfeng

Look at the figure below, the yellow waveform is the output signal which is at the rate of 10Gb/s by the SFP module, the green one is the signal recovered by the ADN2915. I am confused why the signal becomes worse after the CDR. I have also tested the 1Gb/s signal which waveform is very good. Is it wrong with my PCB design? My PCB is FR-4 double-plate with 1.3mm trace width. Can I get your schematic diagram and the pcb document if it is possible?  Hoping for your help, thank you very very much!

QQ截图20150809101039.png

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