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https://designers-guide.org/forum/YaBB.pl Analog Verification >> Analog Performance Verification >> Theoretical noise floor in FFT https://designers-guide.org/forum/YaBB.pl?num=1319887422 Message started by yvkrishna on Oct 29th, 2011, 4:23am |
Title: Theoretical noise floor in FFT Post by yvkrishna on Oct 29th, 2011, 4:23am Hi all, I happen to see this expression for Average FFT noise floor in many Application Notes. ---------- Average FFT Noise Floor (dB) = 6.02n + 1.76dB + 10 log(3*M / (pi * ENBW)), where M is the number of data points in the FFT. ENBW is the equivalent noise bandwidth of the window function (see next section on how FFTs are generated) n is the number of bits of the A/D converter ---------- Please help me in finding a reference for deriving this expression. Thanks, yvkrishna |
Title: Re: Theoretical noise floor in FFT Post by loose-electron on Oct 29th, 2011, 5:53pm Waving the magical Google wand.... www.analog.com/static/imported-files/tutorials/MT-001.pdf Seems to all be there. |
Title: Re: Theoretical noise floor in FFT Post by yvkrishna on Nov 4th, 2011, 1:28pm thanks loose-electron. |
Title: Re: Theoretical noise floor in FFT Post by loose-electron on Nov 5th, 2011, 1:07pm no problem - I frequently find more useful information in application notes from vendors than from the IEEE |
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