Please explain $-$ Consider the voltage$-$amplifier circuit model shown in Fig. $1\mathrm{.}16($b$),$ in which Avo $=10$ V$/$V under the following conditions:

$($a$)Ri=10Rs,R_L=10Ro$

$($b$)Ri=Rs,R_L=Ro$

$($c$)Ri=R\frac{s}{10},R_L=R\frac{o}{10}$

Calculate the overall voltage gain $\frac{v_o}{v_s}$ in each case, expressed both directly and in decibels.

Figure HW $1-3($a$)$ Circuit model for the voltage amplifier. $($b$)$ The voltage amplifier with input signal source and load.