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Issue of AD9954 sweep at Low Frequencies

Question asked by Arslan on Oct 29, 2017
Latest reply on Oct 30, 2017 by KennyG



I am generating a 15MHz bandwidth sweep from AD9954 with center frequency at 140MHz and everything is fine until I generate a sweep of the same 15MHz bandwidth, center frequency at 50MHz. The amplitude of the of the sweep reduces from -7dBm to -21dBm. I have tested the Low Pass Filter with cut off at 160 MHz on the output of DDS, again and again, it has no problem. Can anyone please suggest what may the issue? Thankyou