Part Number: AFE7920
We're struggling with an unwanted spurious signal inside the 3.5GHz Rx path. Several tests have shown that the spurious signal is related to the JESD output rates (92.16M) in the receive chain.
The evaluation board was made by ourselves to check the AFE7920's performance. Other bands including 1.8G and 2.1G work well.
Chip initialization & handling has been done by Latte, or Firmware using API CAFE2p4.
If anyone has a similar experience or solution, could you let us know?
We have not observed any spur with related to the uplink data rate (RX data rate) of 92.16MHz. We have received your request from JH. We will definitely look into this further and get back to you.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
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In reply to Kang Hsia:
Thanks for your reply. Actually, the spurious signal comes on 3409MHz, which is 37 times the 92.16MHz. In our evaluation board, The JESD data rate is 184.32MHz, and we assume the data frequency is the half of data rate.
If we change the JESD data rate to another one, i.e. 245.76MHz, the spurious in the 3.5G band disappears. We've spent months to resolve this, but it's still not working. So please provide us with quick solutions and support. It's urgent.
In reply to YG Jeong:
Our apps engineer Eben would like to schedule a call with you. We have reached out to JH offline. Please advise JH on a convenient time for the call.
I'll contact JH.
closing thread and going through offline discussion.
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