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Problem with eye diagram noisy

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surianova

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hi!

I current testing my transmitter with I/O LVDS interface. One weird thing when i run with input 1 Gbps , the output eye diagram is very nice but when i run with input 600 mbps, the output eye diagram become very noisy. What would be the course ? Is it impedance matching issue or related to quality of PCB board?

Tx for your reply.
 

eye diagram noisy

usually, your amplifier need larger bandwidth
 

Re: eye diagram noisy

"Is it impedance matching issue or related to quality of PCB board?"

Shouldn't be neither of those two options, since you're evaluating your circuit at lower bit rate. Sounds strange...

Please explain your circuit and test method further.
 

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