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diff --git a/284/CH12/EX12.3/ex3.sce b/284/CH12/EX12.3/ex3.sce
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+// Chapter 12_The junction field effect transistor
+//Caption_Depletion mode JFET
+//Ex_3//page 558
+T=300
+Na=10^18
+e=1.6*10^-19
+eps=8.85*10^-14*11.7
+Vbi=0.814
+Vpo=4.35
+ni=1.5*10^10
+Nd=10^16
+a=0.75*10^-4    //metallurgical channel thickness
+L=10*10^-4   //channel length
+W=30*10^-4    //channel width
+mun=1000
+Ipi=10^3*mun*(e*Nd)^2*W*a^3/(6*eps*L)
+IDmax=Ipi*(1-3*(Vbi/Vpo)*(1-(2/3)*(Vbi/Vpo)^0.5))
+printf('The maximum current is %1.3f mA while pinch off current is %1.3fmA',IDmax,Ipi)
+\ No newline at end of file