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Carrier in the PSK spectrum using AD9953

Question asked by HariprasadJ on Nov 29, 2015
Latest reply on Dec 2, 2015 by HariprasadJ

Hello,

I am using AD9953 for the PSK modulation. I have written the RAM values as 0x00000000,0x40000000,0x80000000, 0xC0000000 for 0,90,180,-90 phase shifts.But I am getting carrier spectrum along with the PSK modulated spectrum as shown in the figure. What might be the reason for the same.

 

Carrier_Interfearing_In_DDS.jpg

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