
Principles of Analog Electronics
514
Finally the term
v
l
can be expressed as
=
+
2,
12,
v
b
s
I
which is another attenuation factor.
The overall voltage gain is therefore
1
1
1
2,
2, 2
1,1, 22,
1
12,
12,
()
()
=−
+
++
++
+
A
hR
hR h
hR hhR
h
R
v
fe E IIL
fe E IIL ie
fe CI II ie fe E IIL
ie
I
14.6 DOUBLE-STAGE C.C.–C.E.
Figure 14.18 shows an example of a double-stage C.C.–C.E. amplier.
The AC analysis follows, with reference to the equivalent AC model (Figure 14.19).
For convenience, resistors
and
can be combined into
||
RRR
,
and resistors
1,II
and
can be combined into
||
RRR
.
We want to perform the AC analysis rst ...