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+// Chapter 6 example 14
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given data
+gm      = 50*10^-3;       // conductance in mho
+cgs     = 0.6*10^-12;    // gate to source capacitance
+cgd     = 0.015*10^-12;  // gate to drain capacitance
+Rg      = 3;             // gate resistance in ohm
+Rs      = 2;             // source resistance in ohm
+Ri      = 2.5;           // intrinsic channel resistance
+Rds     = 400;           // drain to source resistance
+
+// Calculations
+fT      = gm/(2*%pi*cgs);   // device's fT
+t3      = 2*%pi*Rg*cgd;
+r1      = (Rg+Rs+Ri)/Rds;
+fmax    = fT/(2*sqrt(r1 + (fT*t3)));    // max usable frequency
+if fmax>40*10^9 then
+    mprintf('Operation at 40 GHz is Theoretically possible\n');
+end
+
+// Output
+mprintf(' fT = %3.1f Ghz\n fmax = %3.1f',fT/10^9,fmax/10^9 )