ywguo
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Hi icekalt,
One point you must have in mind, what we expect at the ADC output is discrete signal. So be careful don't make FFT to the continuous waveform. I don't know LTSpice. It seems to be a SPICE like simulator. Now that you simulate with LTSpice, print every sample of the ADC output. If you don't have any other tool at hand, you have to write a matlab program to process the printed results.
Try to print the ADC output with the following command in SPICE file. .tran step start stop $ set step = sample time .print D_7 D_6 D_5 D_4 D_3 D_2 D_1 D_0 $ print the voltages of ADC output
Best Regards, Yawei
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