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+//Example 10.1. refer fig.10.8.

+clc

+format(6)

+hie=1600

+hfe=60

+hre=5*10^-4

+hoe=25*10^-6

+hic=1600

+hfc=-61

+hrc=1

+hoc=25*10^-6

+disp("The AC equivalent circuit of the CE-CC amplifier is shown in fig.10.9(a)")

+disp("The Second Stage :")

+disp("Current gain :")

+disp("The current gain of a particular stage is given by")

+disp("                  AI = -hf / (1 + ho*ZL)")

+disp("For the second stage ZL = RE2 and the current gain of the second stage is")

+RE2=4000

+AI2=-hfc/(1+(hoc*RE2))

+disp(AI2,"                 AI2 = -Ie2 / Ib2 = -hfc / (hoc*RE2) =")

+disp("The input impedance Ri of a particular stage is given by")

+disp("                  Ri = hi + hf*AI*ZL")

+disp("For the second stage,")

+Ri2 = hic + (hrc*AI2*RE2)

+Ri22=Ri2*10^-3

+disp(Ri22,"          Ri2(k-ohm) = hic + (hrc*AI2*RE2) =")

+disp("Thus, the CC stage has a high input impedance.")

+disp("The voltage gain of a particular stage is")

+disp("                  AV = (AI*ZL) / Zi")

+disp("For the second stage,")

+Re2=4000

+AV2=(AI2*Re2)/Ri2

+disp(AV2,"                 AV2 = Vo/V2 = (AI2*Re2) / Ri2")

+disp("The First Stage :")

+RC1=4000

+format(5)

+RL1=(RC1*Ri2)/(RC1+Ri2)

+RL11=RL1*10^-3

+disp(RL11,"              RL1(k-ohm) = RC1 || Ri2 =")

+disp("Current gain,")

+AI1= -hfe/(1+(hoe*RL1))

+disp(AI1,"                 AI1 = -IC1/Ib1 = -hfe/(1+(hoe*RL1)) =")

+disp("The input impedance of the first stage, which is also the input impedance of the cascaded amplifier is")

+Ri1=hie +(hre*AI1*RL1)  // answer in textbook is wrong 

+Ri11=Ri1*10^-3

+disp(Ri11,"         Ri1(k-ohm) = hie + hre*AI1*RL1 =")

+disp("The voltage gain of the first stage is")

+format(7)

+AV1=(AI1*RL1)/Ri1  // answer in textbook is wrong 

+disp(AV1,"                 AV1 = V2/V1 = (AI1*RL1) / Ri1 =")

+disp("The output admittance of the first transistor Q1")

+RS=600

+format(5)

+Yo1=hoe-((hfe*hre)/(hie+RS))

+Yo0=Yo1*10^6

+disp(Yo0,"           Yo1(uA/V) = hoe - ((hfe*hre) / (hie+RS)) =")

+disp("The output impedance of the first stage")

+format(6)

+Ro1=1/Yo1

+Ro0=Ro1*10^-3

+disp(Ro0,"          Ro1(k-ohm) = 1 / Yo1 =")

+disp("The output impedance taking RC1 into account is")

+format(5)

+Rot1=(Ro1*RC1)/(Ro1+RC1)

+Rott=Rot1*10^-3

+disp(Rott,"        Rot1(k-ohm) = Ro1 || RC1 =")

+disp("This is the effective source resistance RS2 of the second stage")

+disp("The output admittance of the second stage")

+format(7)

+Yo2=hoc-((hfc*hrc)/(hic+Rot1))

+disp(Yo2,"            Yo2(A/V) = hoc-((hfc*hrc) / (hic+Rot1)) =")

+disp("Output impedance,")

+format(4)

+RO2=1/(11.525*10^-3)

+disp(RO2,"            RO2(ohm) = 1 / Yo2 =")

+disp("The amplifier output impedance taking RE2 into account is RO2 || RE2")

+format(6)

+Ro2=(87*4000)/(87+4000)

+disp(Ro2,"Hence,      Ro2(ohm) = (RO2*RE2) / (RO2+RE2) =")

+disp("Overall current gain :")

+disp("The output or total current gain of both the stages is")

+disp("              AI = -Ie2 / Ib1 = (-Ie2/Ib2)(Ib2/IC1)(IC1/Ib1)")

+disp("                 = -AI2*(Ib2/Ic1)*AI1")

+disp("From fig.10.9(b),")

+disp("             Ib2 = (-IC1)(Rc1 / Rc1+Ri2)")

+Rc1=4000

+format(7)

+x=(-Rc1)/ (Rc1+Ri2)

+disp(x,"         Ib2/Ic1 = -Rc1/ Rc1+Ri2 =")

+format(6)

+AI=-AI2*x*AI1

+disp(AI,"             AI = -AI2*AI1*(Rc1 / Ri2+Rc1) =")

+disp("The overall voltage gain of the amplifier,")

+disp("             AV = Vo / V1 = (Vo/V2)(V2/V1)")

+AV=AV2*AV1

+disp(AV,"            AV = AV2*AV1 =")  // answer in textbook is wrong

+disp("The overall voltage gain taking the source impedance into account,")

+format(4)

+AVs=AV*(Ri1/(Ri1+RS))

+disp(AVs,"          AVs = Vo/Vs = Av(Ri1 / Ri1+Rs) =") // answer in textbook is wrong
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