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Common Mode Input Signal

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themaccabee

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Hi,
The output voltage of a simple differential opamp amplifier is being said as
Vo=Ad(Vb-Va)+Ac(Vb+Va)/2

We can definetly derive the differential mode gain using super position theorem.
But can somebody tell me how the common mode input signal is taken as (Vb+Va)/2??
Is it simply taken as the average of input siganls?\
Thanks & Regards
7870.DA.jpg
 

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