ECE 3150
Spring 2009
Week 12 Recitation
Lab 4 and Homework 9 due on Friday.
Homework 9 is much simpler than previous ones.
We will finish most of the firstorder circuits on Wednesday, and start digital circuits soon.
For Wednesday and Thursday sessions, you can make them shorter, as the students have spent
much time for labs and there are two assignments due.
Additional problems if there is time remaining: students probably need more time to digest the
effective impedance method, especially in CD amplifiers.
CS amplifier:
(
29
x
gs
m
L
gs
x
sig
gs
x
i
v
g
R
v
v
R
v
i
+

=
+

=
'
/
/
Canceling
v
gs
and rearranging to obtain the ratio of
v
x
and
i
x
.
(
29
'
'
1
/
L
sig
L
m
x
x
gd
R
R
R
g
i
v
R
+
+
=
=
Fig. 1.
The smallsignal circuits for the CS amplifier with ideal biasing circuits.
CG amplifier:
s
vo
o
out
vo
L
m
o
m
L
o
in
R
A
r
R
A
R
g
r
g
R
r
R
+
=
+
2245
+
+
=
1
1
(7.20)
g
m
v
gs
v
sig
+

R
sig
R
L
’
= R
L 
r
o
+
v
out


v
x
+
i
x
+
v
gs

1
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Fig. 2.
The small signal circuit for the CG amplifier with the capacitors.
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