I am using AD9152-FMC-EBZ, working in mode 6, working clock is refclk=125M, fin=250M, fdac=500M. The status indication signals are all correct, but qpsk output is not good, but similar code works in other board ，the EVM is equal to 4.do i have something ignored. Please give me some suggestions,
Question moved to High-Speed DACs forum.Andrei
jerryguo, Can you please reply?
It is high-speed DAC.
if I read correctly, there is another AD9152-FMC-EBZ board that you are able to get a clean spectrum on?
looking at the spectrum (DC to 1GHz) it seems to me that you have the wrong interpolation setup for the signal. you can see the interpolation filter pass band in the spectrum.
Also, seems like you have Fdac=500MHz and a signal that is 1GHz wide.... at least from the plot above.
I have not another AD9152-FMC-EBZ board that can get a clean spectrum on,I set the value of interpolation=2,My parameters are as follows.
I don't know which part of the interpolation error you are talking about,What is the problem about the configuration of the interpolation filter? Can you elaborate on it? Is there a modified example for reference?