(Solved):     The figure below shows the small-signal, equivalent-circuit model of a bipolar ju ...

 

 

The figure below shows the small-signal, equivalent-circuit model of a bipolar junction transistor (BJT) with \( r_{x}=80 \Omega, r_{\pi}=2.5 \mathrm{k} \Omega, r_{\mu}=15 \mathrm{M} \Omega, r_{o}=260 \mathrm{k} \Omega \), and \( g_{m}=70 \mathrm{~mA} / \mathrm{V} \). Calculate its \( z \)-parameters and choose the correct statements. \( z_{12} \) is the transimpedance gain \( A_{z} \) \( z_{11} \) is the smallest among these four \( z \)-parameters. \[ z_{22}=64.2 \mathrm{k} \Omega \] \[ z_{21}=11.2 \mathrm{M} \Omega \] \( z_{11} \) is the input resistance \( R_{i n} \) of the BJT.