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why does a DDS output voltage vary with frequency...?

Question asked by Venugopal on May 31, 2012
Latest reply on Jun 22, 2012 by Venugopal

Hello everyone,

 

Using AD9913 Eval Board, i am producing sine waves of frequencies 3MHz to 32MHz. With the full scale DAC output current set to 4.6mA, i am getting different peak-peak voltages at different frequencies. i.e, for a frequency of 6MHz i get an output of around 300mVp-p and for a freq of 32MHz i get 100mVp-p.

 

1.  Why is the output voltage varying with frequency...?

2.  Is this natural for all current out devices...?

3.  Is there any way i could regulate the output ac voltage to produce a constant voltage at all frequencies from 3MHz to 32MHz....?

 

Thanks in advance,

Venugopal

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