$10\mathrm{.}45$ Design a CB amplifier for maximum output swing and determine its high$-$frequency response when $f_T=2{10}^{7}Hz,=200,V_{BE}=0\mathrm{.}7V,C_{ob}=4pF,R_{\text{s}\text{o}\text{u}\text{r}\text{c}\text{e}}=50,R_E=400,R_{\text{l}\text{o}\text{a}\text{d}}=5k$ and $V_{CC}=12V.$ The low$-$frequency cutoff must be at $20$ Hz $.$ Use the circuit shown in Figure P$10\mathrm{.}43.$