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When I tried to analyze an inverting amplifier gain, there was a problem
As you can see above, eq(12.2) is from Figure 12.1 [Razavi, Design of Analog CMOS IC]
However, if the gain is derived by using feedback technique, the equation is 12.4.
They have Rout/R2, but one is at denominator and the other is at numerator.
Can you explain why they show a difference?
I think the equations should be same although there is a finite Rout.