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E5505 Digitizer

Question asked by JimTores on Dec 30, 2011
Latest reply on Jan 3, 2012 by RayH

My question is regarding E5505 Noise test set system. We use it as a phase noise/spur measurement system.
Could you explain to me what is the purpose of the digitizer in the system(was not able to find the answer in data sheet)
More specifically,obviously  the ADC side is used for FFT.
1. Why do I need FFT since L(f) is obtained from the phase fluctuations base band spectrum on PXA9030A.
2. What is the "CHIRP SOURCE IN" used for?(goes from DAC on the digitizer to Test set chirp in input).


Jim Tores