ECE 3150
Spring 2009
Week 2 Recitation
Ask for Homework questions first on Homework 1 (you can choose to do Work problems
below first)
Additional Work problems:
1.
Review the Thevenin equivalent circuit by the capacitive divider in Fig. 1.11:
First observe it as a capacitive divider (may be in Laplace transform), make sure that this
is right when there is no
R
(cutline looking to left).
Now, put in
R
,
v
O
will be drained
according to
RC
t
=
R(C
1
+C
2
)
towards 0.
Make observations why it is reasonable.
Hint:
R
needs to charge/discharge which capacitor when it is first connected?
2.
Prove the following two circuits are equivalent when observing from the external
ports (i.e., no external observable relations will change like Thevenin and Norton
equivalence)
+

v
I
C
1
C
2
R
+
v
O

+

v
t
C
t
R
+
v
O

g
m
v
gs
v
gs
G
S
D
+

i
d
i
s
v
ds
+

D
1/g
m
g
m
v
gs
v
gs
G
S
+

i
g
=0
i
d
i
s
v
ds
+

i
g
=0
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Review the source absorption and source splitting techniques, then prove the following
circuits (from the
π
network of MOSFET smallsignal with infinite input/output
resistance to a T network).
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 Spring '07
 SPENCER
 Amplifier, Microelectronics, Transistor, Vgs, gmvgs vds

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