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+// Chapter 6 example 11
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given data
+e       = 1.6*10^-19;   // charge of electron
+Nd      = 10^15*10^6;   // mobility
+L       = 10*10^-6;     // active layer of Barritt diode
+er      = 12.5          // relative permitivity
+eo      = 8.85*10^-12;  // permitivity in F/cm
+
+// calculations
+Ex      = (e*Nd*L)/(2*eo*er) // electric field for Va = Vpt and x = L/2
+E       = Ex/10^2;           // electric field in v/cm
+Vpt     = 10*10^-4*E
+
+// Output
+mprintf('Electric field E(x) = %3.0f KV/cm\n Punch through voltage = %3.0f Volts',E/1000,Vpt);
+//------------------------------------------------------------------------------