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Measure clock jitter with MSO-X 4104A

Question asked by pollarbear on Nov 21, 2013
Latest reply on Nov 22, 2013 by algoss
Hi experts,

I am debugging USB3.0 interface, my FPGA outputs a signal of LVCMOSS, and this signal is just connect to a test point, the trace impedance is 50ohm.

I got a result below. The bandwidth of my probe is 1GHz, I have several questions about it.

a) Why the low level is about 1.7V, not 0V?

b) Why does the falling edge look so bad? 

Any comment is welcomed.