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Question about input voltage and dbFS

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ljy4468

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Hi
I've a question about dbFS.
I know that it is dB scale relative to Fullscale.

So In FFT plot, fundamental bin is -3dB below 0dB,
then input is -3dBFS. isn't it??

And I have a question.
If input Vfs=1V
Then what input voltage is -3dBFS???
 

Alan_Nesta

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dbFS question

first question: yes
second one: db=20log(vin/fs)
so you can get vin=0.707 is -3dBFS
 

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