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Mistake in OPA2350 spec!(Urgent, thank you!)

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dicaleon

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Hello, I have an urgent question about amplifier OPA2350.
In its specification(page 5),you can see the figure about input current noise spectrual density&frequency .
I just wonder if this figure has a mistake.
I mean....the white noise area and the 1/f noise area is reversed for input current noise. The curve of input current noise should be same with input voltage noise.

Thank you very much!
 

FvM

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No. Noise current density of FET is generally increasing with frequency.
 

dicaleon

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I see! Thank you very much!
Actually, i am simulating input noise of a circuit used OPAMP2350.
For input voltage noise, we can use this formula as below:
Vnrms(fl,fh)=Vnw*root(fc*ln(fc/fl)+(fh-fc))
But if noise current density of FET is generally increasing with frequency, how can i calculate it?
 

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