EE 230
Homework 12
Spring 2010
Assume all MOS transistors have model parameters
μ
n
C
OX
=100
μ
A/V
2
, V
Tn
=1V,
and
λ
=0.
Correspondingly, assume all BJT
transistors have model parameters
J
S
A= 10
12
A ,
β
=100, and V
AF
=
∞
.
For the data converter problems, use the CAD tool
of choice.
EXCEL, Matlab, or C are some tools you have available that should be useful
for solving these problems.
Problem 1
a)
Draw the small signal equivalent circuits.
Assume Q
1
is in the
Forward
Active region, the capacitors are large,
and
V
M
is small.
b)
Determine the quiescent output voltage
c)
Determine the small signal voltage gain.
Page 1 of 4
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View Full DocumentProblem 2
a)
Draw the small signal equivalent circuit.
Assume M
1
is in the saturation region,
Q
1
is in the
Forward Active region, the capacitors are large,
and
V
M
is small.
b)
Size the transistor M
1
so that the quiescent output voltage is 5V.
Assume L
1
=2u.
c)
With the device sizing used in part b), dtermine the small signal voltage gain.
400K
DD
V
OUT
1
1
1
V
(t)=V
M
sin(
ω
t+
θ
)
Problem 3
A multimeter displays 4 decimal digits.
How many bits of resolution is
needed for an ADC internal to the multimeter if the fullscale output is to be accurate to 1
decimal digit.
Problem 4
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 Fall '08
 mina
 Mass, Transistor, quiescent output voltage, ideal 12bit ADC

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