Question 5.20: For the network of Fig. 5.108 , determine: a. Z i . b. Z o ....
For the network of Fig. 5.108 , determine:
a. Z_i .
b. Z _o .
c. A_{v}.
d. A_i .
a. Z_{i}=R_{B}\left\|h_{i e}=330 k \Omega\right\| 1.175 k \Omega
\cong h_{i e}=1.171 k \Omega
b. r_{o}=\frac{1}{h_{o e}}=\frac{1}{20 \mu A / V }=50 k \Omega
Z_{o}=\frac{1}{h_{o e}}\left\|R_{C}=50 k \Omega\right\| 2.7 k \Omega=2.56 k \Omega \cong R_{C}
c. A_{v}=-\frac{h_{f e}\left(R_{C} \| 1 / h_{o e}\right)}{h_{i e}}=-\frac{(120)(2.7 k \Omega \| 50 k \Omega)}{1.171 k \Omega}=-262.34
d. A_{i} \cong h_{f e}=120
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