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AD9767 TxDAC how to reduce even order harmonics

Question asked by DferTU on Apr 2, 2015
Latest reply on Apr 15, 2015 by DferTU

Hello,

 

I've been testing the AD9767 14 bits DAC with the next simple test tone:

Form a fpga development board a tone is continuosly sent to the AD9767 with the next I/Q samples:

I = 1,0,-1,0,... (same for Q delayed 1 sample). I'm using only one of the I or Q port.

The desired output frequency is 1/4th of the sampling frequency but also even harmonics appears.

The output configuration is a RC filter in each current output leg of the DAC and the voltage signal

is converted to single-ended with a balun transformer.

 

Is there any way to eliminate or to reduce even order harmonics? How much the reduction would be?

 

Many Thanks,

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