I want to sample a narrow band (kHz) signal with a carrier frequency of about 2 GHz. I am trying to measure nonlinear mixing products, which I expect to be very small. Because these mixing products are small, I do not want to use a mixer to mix down to baseband (mixers are nonlinear).
I would like to measure with a sampling rate of about 2 GS/s, so that the signal of interest is aliased down to baseband. To resolve closely-spaced tones, I will then take a really long sample and do an FFT.
Do any of the AD9625 evaluation boards support acquisition over very long times (seconds if possible), with a sample rate of 2 GS/s?