Given the attached circuit find (a) The DC bias point and small signal midband AC model for the transistor. Draw the small signal midband AC equivalent circuit.
(b) Find the small signal midband AC voltage gain vo/vi and the overall voltage gain vo/vs (c) Find the small signal midband AC input and output resistances.
The answers are given in the back of the book.
(a)
Ic = 5.6mA, gm = 215mA/B
r(pie)=232 Ohms
(b)
vo/vi = 0.88 and vo/vs = 0.44
(c) Ri = 1k Ohm and Ro = 15 Ohms
Anyone know how to get these answers? I started off by getting Rth and Vth
VBB = [R2/(R1+R2)]Vcc = (6.8kohms/9.8kohms)5V = 3.47V
RBB = R1||R2 = 2081.6 Ohms
but I don't know how to do the rest and I really need to know how. Thank you.
(b) Find the small signal midband AC voltage gain vo/vi and the overall voltage gain vo/vs (c) Find the small signal midband AC input and output resistances.
The answers are given in the back of the book.
(a)
Ic = 5.6mA, gm = 215mA/B
r(pie)=232 Ohms
(b)
vo/vi = 0.88 and vo/vs = 0.44
(c) Ri = 1k Ohm and Ro = 15 Ohms
Anyone know how to get these answers? I started off by getting Rth and Vth
VBB = [R2/(R1+R2)]Vcc = (6.8kohms/9.8kohms)5V = 3.47V
RBB = R1||R2 = 2081.6 Ohms
but I don't know how to do the rest and I really need to know how. Thank you.
Attachments
-
17.4 KB Views: 39