small signal equivalent circuit of a bipolar transistor amplifier

Question 1

Iᴮ =

Answer 1

Iᴮ = Vin/hie

Question 2

Iᶜ =

Answer 2

Iᶜ = Iᴮ β (β is same as hfe)

Question 3

Vo =

Answer 3

Vo = Ic Rc

Question 4

f1 =. high pass filter with cut off frequency, f1

Answer 4

f = 1/(2pi Rin C)

Question 5

Rin =

Answer 5

Rin = (Rb hie)/(Rb + hie)

Question 6

Av = (voltage gain)

Answer 6

Av = Vo/Vi = - (hfe Rc)/hie