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diff --git a/863/CH5/EX5.3/Ex5_3.txt b/863/CH5/EX5.3/Ex5_3.txt
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+//Caption:Design an inverter by determining input resistance,current and capacitance 
+//Ex5.3
+clc;
+clear;
+close;
+Vo=11//Output voltage(in volts)
+Vcc=12//Collector voltage(in volts)
+Vi=6//Input voltage(in volts)
+f=1//Frequency(in Khz)
+Vb=0.5//Base voltage(in volts)
+Vee=-12//Emitter voltage(in volts)
+Ib=500//Max base current(in nA)
+Vc=2//Collector voltage(in volts)
+Vr2=Vb-Vee
+I2=100*Ib*0.001
+R2=Vr2/I2
+i=Vr2/R2
+R1=(Vcc-Vb)/i
+Ri=(R1*R2)*1000/(R1+R2)
+Ii=Vi*1000/Ri
+pw=1000/(2*f)
+C=(Ii*pw)*10^(-6)/Vc
+disp(C,Ii,Ri,'Input resistance(in kilo ohm),Input current(in micro ampere) and Capacitance(in micro farad)=')
+\ No newline at end of file