In my custom board I am interfacing AD9375 with Zynq Ultrascale plus MPSoC (XCZU11EG-ffvc1156).
I am using version of HDL code and No-OS application.
I am doing ORx to Tx loopback in RTL
Tx sampling rate : 245.76MSPS
ORx sampling rate : 245.76MSPS
From VSG I am feeding QPSK modulated signal at ORx input and monitoring the Tx output in VSA, QPSK constellation, spectrum are perfect and EVM is 3-4% in VSA for QPSK symbol rates between 1Msymb and 8Msymb,
But when I increase symbol rate beyond 8Msymb my constellation is not proper and EVM is dropping to 11-14%.
Do I need to change any filter configurations when my symbol rate is above 8Msymb, please suggest me how to proceed further.