Looking for devices that can perform straight forward I/Q demodulation process

Hi guys,
I am looking for a high speed NI board that can perform the quadrature demodulation (for a 20 MHz signal), I have looked through the web but so far I can only find 5620, 5660 and 5142.
cos(wt) ----> Device under Test (DUT) -----> Acos(wt + theta)
cos(wt) is the original tranmitting signal (20 MHz). After it is passed through the DUT, amplitude change (A) and phase shift (theta) is then introduced into the output signal (the frequency still remains the same.) The purpose of this setup is to measure the amplitude change and phase shift, relative to the original signal.
Thus I need a simple I/Q demodulation board that can perform this job. Is there any NI board that one can recommend? Or is there a board that can generate the driving signal and do the IQ domodulation at the same time? I think 5620, 5660 and 5142 can only perform I/Q demodulation process...
Thanks for the help!

Duplicate post. See response here.

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