My customer is using AD-FMCDAQ2-EBZ.They seem to be dissatisfied with matching coaxial terminals used for input and output.Can you show how much bandwidth the input / output terminals match?
The board was designed as a reference for our customers to build off of it.
We tried to match the differential traces as much as possible. as well as the two channels to each other on either the transmit or receive. Due to the board size and shape, we did the best we can.
If your customer is trying to redesign the board, they should try to match everything based on their design. the better-matched things are the better they perform.
What do you mean by how much the input / output terminals match?
Are you talking about how much the inputs are matched to each other? and similarly the two outputs?
Are we talking trace matching?
Any clarification on this is appreciated to better answer your question.
I am sorry for taking the trouble.I reprinted the following sentences from the English version of Wikipedia.Because I was not confident in English.I hope this is a good explanation for you.The source of waves incident from the line are the reflections from the load end.If the source impedance matches the line end, it is absorbed at the source end. If the transmission line is not matched at both ends reflections from the load will be re-reflected at the source and re-re-reflected at the load end ad infinitum, losing energy on each transit of the transmission line.This can cause a resonance condition and strong frequency-dependent behavior. In a narrow-band system this can be desirable for matching, but is generally undesirable in a wide-band system.My customer is using the evaluation board.In designing their PCB they want to know what purpose the evaluation board was designed.This is a question out of the essence of the FPGA reference board, but it is not a joked question, so please answer.I think this problem is similar to the problem of the ripple tolerance of the bandpass filter.I appreciate what you have noted for me.Best regards
This issue has been resolved.
My customer connected the network analyzer directly to the coaxial terminal.They felt uneasy about outputting values that were not 50 Ω from the network analyzer.I told my customers, ADI says "Due to the board size and shape, we did the best we can."My customer seems to have calmed down.Thank you very much.
Glad this is all set.
Retrieving data ...