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+// Exa 4.12
+clc;
+clear;
+close;
+// Given data 
+I=0.8;// in mA
+I=I*10^-3;//in A
+V_A= 100;// in V
+Bita=160;
+VT=25;// in mV
+VT= VT*10^-3;//in V
+gm= (I/2)/VT;// in A/V
+Gm= gm;// Short circuit trnsconductance in mA/V
+disp(Gm*10^3,"The value of Gm in mA/V")
+ro2= V_A/(I/2);// in ohm
+ro4= ro2;// in ohm
+Ro= ro2*ro4/(ro2+ro4);// in ohm
+disp(Ro*10^-3,"The value of Ro in kΩ is :")
+Ad= Gm*Ro;// in V/V
+disp(Ad,"Value  of Ad in V/V is :")
+r_pi= Bita/gm;//in Ω
+Rid= 2*r_pi;// in Ω
+disp(Rid*10^-3,"The value of Rid in kΩ is :")
+