I attached a Word document with a circuit:
a) Draw a block diagram of the circuit in feedback control system form.
b) Derive an expression for Io in terms of Vi and the system parameters Av, Ro, RL, and Rf.
c) How should the system be designed to make Io independent of RL? What is the approximate expression for Io in terms of Vi?
RL being load resistor.
This solution is provided in 90 words in an attached .doc file. A .bmp file is attached as well for the block diagram.