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!