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Is it possible to calculate the gain of a closed loop system with Noise? Here's a diagram describing what i mean:

http://img206.imageshack.us/img206/8955/cltfmh8.png

I've got the following so far:

[tex]Vout = \frac{A1A2Vin}{1 + A1A2B} + [/tex] [tex]\frac{AVn}{1 + A1A2B} [/tex]

But the question is asking for the closed loop gain. Would that just be:

[tex]Vout / Vin = \frac{A1A2}{1 + A1A2B} +[/tex] [tex]\frac{AVn}{Vin(1 + A1A2B)} [/tex]

Thanks.

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# Transfer function with noise?

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