Question

I6: (15 points) Given the Op amp Circuit below ECET30S TEST 2 Page 9 of 10 Find the voltage vo and the current i° when the Op Amp assumed ideat--oV Noda A 냐 ao Node B The Op-Amp is no longer ideal with the following characteristics. Again = 250000, Ri = 500k, Rout-5k. 1. Dras the circuit model approximation of the above Op Amp circuit 2. Calculate the voltage Vo and the current io

Ignore all handwriting. Please Solve both parts A and B and show all your work!

Write neatly please! Will rate thumbs up for correct answer!

Answer 1

v_B = 6 times 1 k/(1 + 2) k = 2 v {By super position theorem} v_B = 2 v v_A = v_B = 2 v {due to virtual ground} Apply KCL at node A, we get, I_1 + I_2 = 0 3 - 2/5 k + v_0 - 2/20 k = 0 v_0 - 2/20 k = -1/5 k v_0 - 2 = -20 k/5 k v_0 - 2 = -4 rightarrow v_0 = -2 v v_0 = i_0 10 k rightarrow - 2/10 k = i rightarrow i = -0.2 mA Vertical-bar i Vertical-bar = 0.2 mA