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diff --git a/2702/CH4/EX4.2/Ex_4_2.sce b/2702/CH4/EX4.2/Ex_4_2.sce
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+// Exa 4.2
+clc;
+clear;
+close;
+// Given data
+V_DD= 1.5;// in V
+V_SS= V_DD;// in V
+KnWL= 4;// in mA/V^2
+KnWL=KnWL*10^-3;// in A/V^2
+Vt= 0.5;// in V
+I=0.4;// in mA
+I=I*10^-3;//in A
+R_D= 2.5;// in kΩ
+R_D= R_D*10^3;// in Ω
+
+// Part (a)
+disp("Part (a)")
+V_OV= sqrt(I/KnWL);// in V
+V_GS= V_OV+Vt;// in V
+disp(V_OV,"Value of V_OV in volt is : ")
+disp(V_GS,"Value of V_GS in volt is : ")
+
+// Part (b)
+disp("Part (b)")
+V_CM= 0;// in volt
+V_S= -V_GS;// in volt
+disp(V_S,"Value of V_S in volt is :")
+I=0.4;// in mA
+i_D1= I/2;// in mA
+disp(i_D1,"Value of i_D1 in mA is :")
+i_D1=i_D1*10^-3;// in A
+V_D1= V_DD-i_D1*R_D;// in V
+V_D2=V_D1;// in V
+disp(V_D1,"Value of V_D1 in volt is ")
+disp(V_D2,"Value of V_D2 in volt is ")
+
+
+// Part (c)
+disp("Part (c)")
+V_CM=1;// in V
+V_GS= 0.82;// in V
+V_G= 1;// in V
+V_S= V_G-V_GS;// in V
+disp(V_S,"Value of V_S in volt is :")
+i_D1= I/2;// in mA
+disp(i_D1,"Value of i_D1 in mA is :")
+i_D1=i_D1*10^-3;// in A
+V_D1= V_DD-i_D1*R_D;// in V
+V_D2=V_D1;// in V
+disp(V_D1,"Value of V_D1 in volt is ")
+disp(V_D2,"Value of V_D2 in volt is ")
+
+// Part (d)
+disp("Part (d)")
+V_CM_max= Vt+V_DD-i_D1*R_D
+disp(V_CM_max,"Highest value of V_CM in volt is :")
+
+// Part (e)
+V_S= 0.4;// in V
+disp("Part (e)")
+V_CM_min= -V_SS+V_S+Vt+V_OV;// in V
+disp(V_CM_min,"Lowest value of V_CM in volt is")
+V_Smin= V_CM_min-V_GS;// in volt
+disp(V_Smin,"Lowest value of V_S in volt is")
+