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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)
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