I have a project where I am doing a digital down-conversion of a modulated signal at around 200 kHz.
The signal is generated by a Rigol DG1032Z and sampled by an AD7760 (24bit 2.5MSPS ADC), now the problem is there is clock drift between the two devices so when I do a digital zero-IF down conversion the the carrier from the signal generator does not quite match the IF freq.
So I guess the solution would be to have a common clock reference for both devices?
Now the AD7760 has a 40MHz reference OSC and the signal gen has a standard 10MHz reference input, so either I take the 40MHz and divide it down to 10MHz or have an external 10MHz reference which is then multiplied by 4.
Now, I would assume that phase jitter is going to be a big problem, I need all of the bits I can get out of my ADC and the stock OSC is spec'd to 0.7 ps RMS phase jitter (MXO45).
I assume using some flip-flops to divide the 40MHz by 4 would not give adequate performance?
Does anyone have any suggestions?