I have reading started reading the book : Ten Essential Skills for Electrical Engineers by BARRY L.DORR. in the first chapter : How to design resistive circuit. int the proposed exercise 1.2 where I am stuck.

I have assumed that the Voffset=VA is 5*3.3/8=2.0625V for Vs=0, to make my calculation easy.

I have also calculated the gain of G=3.3/8=2.0625 which is exactly as the Voffset.

after a couple of calculation trial using the thevening theorem for the AC mode. I ended up both in the wrong value of R1 and R2, so it is for the simulation and compared to the result provided by the book R1=930 and R2=1400.

my result for R1=R3*(1-G-G^2)/G^2.=8000 roughly which is wrong.

below you can see the exercise and how I named it.

I am still wondering where I did make a mistake in the begining because I have split the solution into two:

1-AC mode:Rth=R2//R3, Vth=Vs*Rth/[Rth+R1+R4] with Vth/Vs=3.3/8. I took R1=fc(R2,G,R2,R3,R4) then replaced it in the DC mode

2-DC mode :Va=Vdc*[R3//(R1+R4)]/[3//(R1+R4)/+R2], with Va/Vdc=2.0625/5=3.3/8

I have assumed that the Voffset=VA is 5*3.3/8=2.0625V for Vs=0, to make my calculation easy.

I have also calculated the gain of G=3.3/8=2.0625 which is exactly as the Voffset.

after a couple of calculation trial using the thevening theorem for the AC mode. I ended up both in the wrong value of R1 and R2, so it is for the simulation and compared to the result provided by the book R1=930 and R2=1400.

my result for R1=R3*(1-G-G^2)/G^2.=8000 roughly which is wrong.

below you can see the exercise and how I named it.

I am still wondering where I did make a mistake in the begining because I have split the solution into two:

1-AC mode:Rth=R2//R3, Vth=Vs*Rth/[Rth+R1+R4] with Vth/Vs=3.3/8. I took R1=fc(R2,G,R2,R3,R4) then replaced it in the DC mode

2-DC mode :Va=Vdc*[R3//(R1+R4)]/[3//(R1+R4)/+R2], with Va/Vdc=2.0625/5=3.3/8

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