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# Answer to Question #190997 in Electrical Engineering for Varshi

Question #190997

onsider the single stage amplifier, values of h-parameters are hie=X1.X2 kΩ, hfe=(150-X1), hre=X1. X2˟10-4 and hoe=50µA/V. Rs=X1X2 Ω, Calculate Av, Ai, Ri, Zo

1
Expert's answer
2021-05-10T02:42:17-0400

"Av=\\dfrac{h_{f_e}}{h_{re}h_{fe}-h_{ve}(R_s+h_{ie})}\n\n\\\\[9pt]\n\n =\\dfrac{149}{1.3\\times 10^{-4}\\times 149-50\\times 10^{-6}\\times (0.013+1.3)}"

Av=7718.46

"Ai=-h_{fe}=-149"

As we know ,

"R_{in}=h_{ie}-\\dfrac{h_{fe}h_{re}}{h_{oe}}\n\\\\[9pt]\n\n\n =1.3-\\dfrac{149\\times 1.3\\times 10^{-4}}{50\\times 10^{-6}}"

"R_{in}=0.912 K\\Omega"

"Z_o=\\dfrac{1}{h_{oe}-\\frac{h_{fe}h_{re}}{R_s+h_{ie}}}"

"=\\dfrac{1}{50\\times 10^{-6}-\\frac{1.49\\times 1.3\\times 10^{-4}}{0.013+1.3\\times 10^3}}\n\\\\[9pt]\n =28.489K\\Omega"

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