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+// Chapter 12_The junction field effect transistor
+//Caption_The MESFET
+//Ex_7//page 570
+e=1.6*10^-19
+eps=8.85*10^-14*13.1
+T=300
+ni=1.8*10^6
+L=1.2*10^-4
+mun=8000
+a=0.70*10^-4
+Idi=75*10^-6
+VGS=0.5
+Vt=0.24
+kn=Idi/(VGS-Vt)^2    //conduction parameter
+W=10^4*kn*2*a*L/(mun*eps)
+printf('The required channel width is %1.2f micrometer',W)
+\ No newline at end of file