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//chapter27
//example27.4
//page581
hie=2000 // ohm
hoe=1d-4 // mho
hre=1d-3
hfe=50
rL=600 // ohm
Zin=hie-hre*hfe/(hoe+1/rL)
// here second term can be neglected compared to hie so
Zin_approx=hie
Ai=hfe/(1+hoe*rL)
// if hoe*rL << 1 then
Ai_approx=hfe
Av=-hfe/(Zin*(hoe+1/rL))
// negative sign indicates phase shift between input and output
printf("input impedence = %.3f ohm \n",Zin)
printf("current gain = %.3f \n",Ai)
printf("voltage gain = %.3f. Here negative sign indicates phase shift between input and output.\n \n",Av)
printf("approximate input impedence = %.3f ohm \n",Zin_approx)
printf("approximate current gain = %.3f \n",Ai_approx)
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