Mumbai University > Electronics Engineering > Sem 4 > Discrete Electronic Circuits

Marks: 10M

Hence Hybrid $\pi$ equivalent circuit becomes,

Av(Voltage Gain) :

The output voltage is,

$ V_O= - (ro|| Rc||RL)g_m Vbe$…………………..(1)

The base emitter voltage Vbe, which controls the collector current, Vbe is voltage across Zi, Applying voltage divider rule,

$Vbe=\frac {R1||R2||r\pi}{R_s+R1||R2||r\pi}Vs$

Substituting value of Vbe in equation (1),

$V_o=-(ro||Rc||RL)g_m\frac{R1||R2||r\pi}{Rs+(R1||R2||r\pi)}Vs$

This gives …