Hi,guys
in the picture, if Vdd=5V , Vss=-5V; input Vi=±100mV, Vo=±4.5V;
When connect two resistors like this, also let Vi=±100mV, how to calc Vo now?
Thanks
Va=Vin*(R2/(R1+R2))+Vout*(R1/(R1+R2)) in your case with R1=R and R2=10R.
If you combine this equation with Vout=A*Va you can eliminate Va and arrive at the formula for G=Vout/Vin. Try it by yourself. Its the classical formula for feedback from the control theory.