B)
$$h_{22e} = \ \frac{I_{0}}{U_{Y}} = \ \frac{0,006}{200} = 3,0\ \bullet 10^{- 5\ }\text{\ S}$$
$$R_{0} = \ \frac{1}{h_{22e}} \approx 33\ k\Omega$$
$$G_{i} = \ h_{22e} + \ \frac{r_{\text{RZ}}\beta}{R_{B} \bullet R} = 3,0 \bullet 10^{- 5} + \ \frac{14,99 \bullet 200}{205000 \bullet 1097} = 4,33 \bullet 10^{- 5}\text{\ S}$$
$$S_{i} = \ G_{i} \bullet \frac{E_{C}}{I_{0}} = \ 4,33 \bullet 10^{- 5}\ \bullet \frac{20}{0,006} \approx 0,14\ \frac{\%}{\%}\text{\ \ }$$
D)
$$R_{0} = \ R_{S} + \ r_{\text{ds}} \bullet \lbrack 2\left\lbrack \frac{U_{\text{RZ}}}{{- U}_{p}} + \ 1 \right\rbrack \bullet \left| \sqrt{\frac{I_{\text{DSS}}}{I_{O}}} \right| - 1\rbrack$$
RS = 1215 Ω (ZATWIERDZONE W OBLICZENIACH)
$$R_{0} = 1215 + 35 \bullet 10^{3}\left\lbrack 2\left\lbrack \frac{6,8}{2,2} + 1 \right\rbrack \bullet \left| \sqrt{\frac{10 \bullet 10^{- 3}}{6 \bullet 10^{- 3}}} \right| - 1 \right\rbrack = 335542\ \Omega$$
UGS = URZ + I0RS = 6, 8 − 0, 006 • 1215 = − 0, 49 V
$$g_{m} = \ \frac{2I_{\text{DSS}}}{- U_{p}}\left( 1 - \frac{U_{\text{GS}}}{U_{p}} \right) = \ \frac{2 \bullet 10 \bullet 10^{- 3}}{2,2}\left( 1 - \frac{0,49}{2,2} \right) = 0,007\ S$$
$$G_{i} = \ \frac{1 + \frac{r_{Z}}{R} \bullet r_{\text{ds}} \bullet g_{m}}{R_{0}} = \ \frac{1 + \frac{r_{Z}}{1097} \bullet 35 \bullet 7}{335542} = \ldots\ $$
R = 1097 Ω (ZATWIERDZONE W OBLICZENIACH)
$$S_{i} = \ G_{i}\frac{E_{S}}{I_{0}} = \ G_{i} \bullet \frac{20}{0,006} = \ldots$$