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What’s the difference between Noise Gain & Signal Gain o

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ZengLei

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We all know that in the two negative-feedback circuit
It’s easy to figure out the Voltage-Gain (Signal Gain)
1. (R1+R2)/R1
2. -R2/R1;

But here I see a terminology “Noise Gain” which is totally new for me
It says the Noise Gain of the two circuits is the same
Noise Gain= (R1+R2)/R1;
Here I got confused!!
What the Noise Gain is? What’s the definition of a noise gain?
How to calculate it…..
What’s the difference between Noise Gain & Signal Gain of an OP-circuit??
Thanks~~~~~~~~
 

claudiocamera

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