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+//chapter22
+//example22.5
+//page493
+
+Vgs1=-3.1 // V
+Vgs2=-3 // V
+Id1=1d-3 // A
+Id2=1.3d-3 // A
+
+g_fs=(Id2-Id1)/(Vgs2-Vgs1)
+
+printf("transconductance = %.3f mho or %.3f micro mho \n",g_fs,g_fs*1d6)