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One question about AD9910's PSK Function

Question asked by guorock Employee on Dec 28, 2010
Latest reply on Apr 28, 2011 by guorock

I am David Guo from CAST,Beijing. One question about AD9910's PSK Modulation.

I used AD9910EVB to do the experiment, see below is the EVB Configuration: the SYSCLK is 100MHz, and let Profile0 output 1MHz, 0 degree phase signal, let Profile1 output 1MHz,180 degree Phase Signal.

AD9910_PSK_Configuration.JPG

By controlling the hardware Profile0 Pin, we can change the output signal's phase. Below is the correct output signal:

1MHz_Output_2.bmp

But I also often get the signal as the attached shown: seems the phase isn't 180 degree.

 

Not sure what the reason is. Thanks!!!!

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