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You wouldn't really put in a tone at 20MHz because this would be an alias into your baseband. So you should put something into your converter at say 9.9MHz. You also want a tone deep inband to include any harmonic distortion so you can measure you SNDR and SNR. also so your simulations don't take to long, you should integrate your noise say from 100K to 10MHz, nyquist of your 20MSps ADC. When you look at your 1/f noise then you would need a longer simulation to measure it.
why to integrate noise from 100khz why not from 0hz ? when we see the data sheets of ad/ti , they are measuring snr at very low frequencies, why to measure it at fs/2 ? is it right thing to measure it at 9.9 mhz?
Yes of course you "measure" your chip and just take more samples but when you are designing and "simulating" i would say 100K as to not increase your simulation time. If you are worried about 1/f then yes you simulate longer and integrate from lower frequencies. And yes you integrate to fs/2. I was just saying you need to put an input tone in at the band edge. It will show different effects like harmonics aliasing into your baseband.
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