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+// Exa 2.17
+clc;
+clear; 
+close;
+// Given data 
+V_D= 3.5;// in V
+I_D= 115*10^-6;//in A
+upCox= 60;// in µA/V^2
+upCox= upCox*10^-6;// in A/V^2
+L= 0.8;//in µm
+V_GS= -1.5;// in V
+Vt= 0.7;// in V
+R= V_D/I_D;// in Ω
+disp(R*10^-3,"The value required for R in kΩ is : ")
+// Formul I_D= 1/2*upCox*W/L*(V_GS-Vt)^2
+W= 2*I_D*L/(upCox*(V_GS-Vt)^2)
+disp(W,"The value required for W in µm is : ")
+
+//  Note:  Calculation of evaluating the value of W in the book is wrong , so the Answer of the book is wrong