(Solved): Calculation   1. The circuit is as shown in the figure \( \beta=60, r_{b b}^{\prime}=100 \) ...

Calculation

 

1. The circuit is as shown in the figure \( \beta=60, r_{b b}^{\prime}=100 \) ? (1) Calculate the \( Q \) point of the circuit. (2) Draw a slightly variable equivalent circuit and calculate \( A_{u}, R_{i}, R_{o} \). (3) If \( U_{s}=10 \mathrm{mV} \) (effective value), Calculate \( u_{i}, u_{o} \) ? (4) If \( C_{3} \) is open circuit, \( u_{i} ? u_{o} \) ?