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+//Example 1.26

+clc

+disp("Step 1: Identify topology")

+disp("The feedback voltage is applied across the resistance R_e1 and it is in series with input signal. Hence feedback is voltage series feedback")

+disp("")

+disp("Step 2 and Step 3: Find input and output circuit")

+disp("To find input circuit, set Vo = 0, which gives parallel combination of R_e1 with R_f at E1 as shown in fig 1.75. To find output circuit, set I_i = 0 opening the input node E1 at emitter of Q1, which gives series combination of R_f and R_e1 across the output. The resultant circuit is shown in fig 1.75")

+disp("")

+disp("Step 4: Find open loop voltage gain (A_v)")

+rl2=(2.2*52.5)/54.7

+format(5)

+disp(rl2,"R_L2(in k-ohm) = R_c2 || (R_f+R_e1) =")

+disp("A_i2 = -h_fe = -50")

+disp("R_i2 = h_ie = 1.2 k-ohm")

+av2=(-50*2.11)/1.2

+format(6)

+disp(av2,"A_v2 = A_i2*R_L2 / R_i2 =")

+rl1=(100*1.2)/101.2

+disp(rl1,"R_L1(in k-ohm) = R_c1 || R_i2 =")

+disp("A_i1 = -h_fe = -50")

+ri2=1.2+(51*(51*1.5/52.5))

+format(6)

+disp(ri2,"R_i1(in k-ohm) = h_ie + (1+h_fe)R_e =")

+av1=(-50*1.185)/75.51

+disp(av1,"Therefore,  A_v1 = A_i1*R_L1 / R_i1 =")

+disp("The overall gain without feedback is given as")

+av=-0.784*-87.91

+disp(av,"A_v = A_v1*A_v2 =")

+disp("")

+disp("Step 5: Calculate beta")

+b=1.5/52.5

+format(7)

+disp(b,"beta = V_f/Vo =")

+disp("")

+disp("Step 6: Calculate D,A_vf, R_if, R_of")

+d=1+(0.0285*68.92)

+format(6)

+disp(d,"D = 1 + beta*A_v =")

+avf=68.92/2.964

+disp(avf,"A_vf = A_v/D =")

+ri=(75.51*200.1485)/(200.1485+75.51)

+disp(ri,"R_i(in k-ohm) = R || R_i1 =")

+rif=54.82*2.964

+format(7)

+disp(rif,"R_if(in k-ohm) = R_i/D =")

+disp("Ro = infinity    because h_oe = 0")

+disp("R''_o = Ro || R_c2 || (R_f+R_e1) = Ro || R_L2 = infinity || 2.11 K = 2.11 K")

+rof=(2.11*10^3)/2.964

+format(4)

+disp(rof,"R''_of(in ohm) = R''_o/D =")