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diff --git a/3515/CH2/EX2.12/Ex_2_12.sce b/3515/CH2/EX2.12/Ex_2_12.sce
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+// Exa 2.12
+format('v',7);
+clc;
+clear; 
+close;
+// Given data 
+I_D= 0.5;// in mA
+I_D= I_D*10^-3;// in mA
+V_D= 3;// in V
+Vt= -1;// in V
+KpWbyL= 1;// in mA/V^2
+KpWbyL=KpWbyL*10^-3;// in A/V^2
+// Formul I_D= 1/2*KpWbyL*(V_OV)^2
+V_OV= sqrt(2*I_D/KpWbyL);// in V
+// For PMOS
+V_OV= -V_OV;// in V
+V_GS= V_OV+Vt;// in V
+R_D= V_D/I_D;// in Ω
+V_Dmax= V_D+abs(Vt);// in V
+R_D= V_Dmax/I_D;// in Ω 
+R_D= R_D*10^-3;// in kΩ
+disp(R_D,"The largest value that R_D can have while maintaining saturation-region operation in kΩ is : ")