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IF signal IQ phase bouncing

Hello everyone,

I used NI 7972 (FPGA target) and NI 5783 (Adapter) to generate IF signals. I want to do IQ sampling on these signals. and calculate the phase and amplitude according to IQ. 

There is a problem, when I update my IF signal, IQ phase has 90 degree change each time. So is there anyway to solve this problem? 



Thank you!

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