Noise Measuring Unit Meaning!

[Shahriar]

Hi

I was reading an article about a Regulator and it was witten as below:

"" Figure 1 combines low noise
components and extra filtering to
achieve an output noise floor of only 6
nV/Sqr(Hz).  "

Can Anybody tell me what does "nV/Sqr(Hz)" Mean!
Of course the electronic Meaning, I know the meaning of nV or Sqr  ;D


ThanX
Shahriar

[linus24]

Hi There,

I'm not sure about this, but I think that noise voltage was referenced as a RMS value.
Since the Root Mean Square equation includes the Square Root of 1/T...and 1/T = f, you have a denominator with sqrt(Hz).  You already know that frequency (f) is in Hertz (Hz).

I think the 6nV is the voltage during 1 period (T)....maybe.

I know this is not a complete explanation, but I hope it helps!


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