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+// Chapter 12_The junction field effect transistor
+//Caption_Device characteristics
+//Ex_2//page 558
+T=300
+Nd=10^18
+Na=2*10^16
+e=1.6*10^-19
+eps=8.85*10^-14*11.7
+ni=1.5*10^10
+Vp=2.25     //pinchoff voltage
+Vbi=0.0259*log(Na*Nd/ni^2)
+Vpo=Vp+Vbi
+a=(2*eps*Vpo/(e*Na))^0.5*10^4
+printf('Metallurgical channel thickness is %1.3f micrometer',a)