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Old 27th April 2008, 09:54 PM   #1
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Default How to calculate S/N ratio

Can someone please tell me how to calculate the S/N ratio of this FFT?

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Thanks
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Old 28th April 2008, 12:34 AM   #2
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nevermind, got it :
95.7 dB
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Old 28th April 2008, 03:56 AM   #3
BWRX is offline BWRX  United States
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It depends what figure you use for the noise. It looks like you just used -70dBV. 25.7dBV is about 19.3V - is this the SNR of your chip amp project at full scale output?
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Old 28th April 2008, 04:39 AM   #4
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Yes I used -70dBV. I believe this is at 45Watts from a LM4780
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