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you need first to understand the ADC terms which may vary from vendor to another. Here is a good guide.:
http://www.analog.com/static/imported-files/tutorials/mt-003.pdf You will need to:
pass single tone through ADC.
apply fft offline on captured data (with say hann window to uncover noise floor)
make your compuations. You need to do computations rather than visually assess spectrum.
you need take into account your fft resolution(which adds false 10log(resolution/2) to SNR).
measure SNR as the difference between top of tone and noise floor which should be reasonably flat(exclude harmonics)
The above link defines terms very well.
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kaz I read the file you uploaded here it was very usefule but now would we check in details
that what are the process?:
-suppose i pass my analog input to fpga now I have 16-bit output
1) how to apply FFT on my captured data?
some papers suggest use signal tap(i dont know how) or spectrum analyzer.
2) what computation should I make?
I just want to have my own circuit SNR and Power spectrum graph (somethings like the files I attached in this post)
would you please answer me these 2 questions?
Thank you
Honored Contributor
