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+//chapter16
+//example16.20
+//page361
+
+R1=3d3 // ohm
+R2=4.7d3 // ohm
+Rs=600 // ohm
+re_dash=20// ohm
+gain_beta=200
+
+Rin_dash=R1*(R2*Rs/(R2+Rs))/(R1+(R2*Rs/(R2+Rs)))
+
+Zout=re_dash+Rin_dash/gain_beta
+
+printf("output impedence = %.1f ohm \n",Zout)