I have the following opamp circuit (attached). I would like to calculate the expression for the gain Vout/Vin. An offset voltage is present in the opamp.
The reference that I have sites the Vout as:
Vout = Vin - Vos(1 + R2/R1)
But I am unable to understand how to arrive at this result. Or is the result wrongly quoted?
You can apply supperposition.
1) VIO = 0, so calculate for Vin. The result is Vo1
2) Vin = 0, now calculate for VIO, put VIO betwen the invertin input and the node betwet both resistors. The result is Vo2
3) finally Vo = Vo1 + Vo2