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+// Chapter 12_The junction field effect transistor
+//Caption_The MESFET
+//Ex_5//page 567
+Nc=4.7*10^17
+e=1.6*10^-19
+eps=8.85*10^-14*13.1
+T=300
+phi_bn=0.89    //barrier height
+Nd=2*10^15
+Vt=0.25
+phi_n=0.0259*log(Nc/Nd)
+Vbi=phi_bn-phi_n   //built in potential barrier
+Vpo=Vbi-Vt
+a=10^4*(Vpo*2*eps/(e*Nd))^0.5
+printf('The channel thickness of GaAs is %1.3f micrometer',a)
+\ No newline at end of file