Here is a definition of noise gain that I read:
Noise gainis the gain seen by a noise source (input voltage noise) or voltage source (input offset voltage) connected in series with an opamp input.
If so in case noise source is series with opamp input then it seems to me that in all case the noise gain and signal gain are always equal. But as in the picture above, in B and C noise gain and signal gain are completely different.
Can you tell me the way to figure out these noise gain formulas?
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