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diff --git a/3515/CH2/EX2.15/Ex_2_15.sce b/3515/CH2/EX2.15/Ex_2_15.sce
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+// Exa 2.15
+format('v',7);
+clc;
+clear; 
+close;
+// Given data 
+I_D= 0.2;// in mA
+I_D= I_D*10^-3;// in mA
+Vt= 1;// in V
+KpWbyL= 0.1;// in mA/V^2
+KpWbyL=KpWbyL*10^-3;// in A/V^2
+// Formul I_D= 1/2*KpWbyL*(V_GS-VT)^2
+V_GS= sqrt(2*I_D/KpWbyL)+Vt;// in V
+V_DSmin= V_GS-Vt;// in V
+disp(V_GS,"Required V_GS in volts is : ")
+disp(V_DSmin,"The minimum required V_DS in volts is : ")
+// For I_D= 0.8 mA
+I_D = 0.8*10^-3;// in A
+V_GS= sqrt(2*I_D/KpWbyL)+Vt;// in V
+V_DSmin= V_GS-Vt;// in V
+disp(V_GS,"Required V_GS in volts is : ")
+disp(V_DSmin,"The minimum required V_DS in volts is : ")