55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 10
Question 1 (1 point unless noted otherwise)
1.
In the circuit below, what is the maximum current that can flow through
reasonable assumptions. (2 points)
? Make
Answer.
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ECE:3410 Quiz 11
An engineer uses the circuit shown to measure the
input bias current of the op amp. She measures the
output voltage at = 0 as 102 mV, and then opens
the switch. She measures the output voltage
= 30 s as 1.9 V. You may neg
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ECE:3410 Quiz 1
14
Below are the output characte
w
eristsics forn an nchann MOSFET Fill in the missing
n
nel
T.
e
blank Also, com
ks.
mplete the fo
ollowing: in the saturatio region, an equation th relates
on
n
hat
to
is
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ECE:3410 Quiz 1
18
tion 1 For the NMOS FET amplifier dr and
e
T
raw
the smallsign equivalen model. The provide
nal
nt
en
pression for calculate the gain . (7 points).
c
g
(
tion
tion 2 Below are the soca
w
alled output ch
haracte
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ECE:3410 Quiz 17
Draw a smallsignal model for the amplifier shown. Then
show that the voltage gain is
=
1 +
For the FET, you can ignore , and assume .
(8 points)
Estimate assuming = 5 mAV and = 470 .
(2 points)
Solution
Smallsignal m
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ECE:3410 Quiz 16
Draw a smallsignal model for the amplifier shown. Then
show that the voltage gain is
=
1 +
For the FET, you can ignore , and assume .
Solution
Smallsignal model:
By inspection
=
(1)
A KVL equation around the path
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ECE:3410 Quiz 1
15
1.
The followin symbol ind
ng
dicates which type of trans
sistor? (1 poin
nt)
(a)
(b)
(c)
(d)
(e)
Channel MOS
SFET
nC
nC
Channel JFET
T
pC
Channel MOS
SFET
nC
Channel JFET
T
BJT
T
Answer: Option (a)
A
2.
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ECE:3410 Quiz 13
Question 1 An engineer uses the circuit shown to estimate both the input offset voltage and
input bias current for the opamp as follows. A = 0 she opens the switch and measures the
output voltage at different times. The t
55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 01
Question 1 (I&N 9th 4.FE1) Given the summing amplifier shown below, determine the value
of
that will produce an output voltage of
. Assume an ideal opamp. (4 points)
S
55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 0 9
Question 1 (1 point unless noted otherwise)
1.
Sketch a two transistor configuration using npn and pnp BJTs that is equivalent to a
single pnp BJT, and label the effec
55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 08
Question 1
Determine the maximum power ratings for the transistor. (15 points)
Solution
The maximum current that can flow is
drain current that the transistor must be ab
55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 07
Question 1 (1 point unless noted otherwise)
1.
Consider the current mirror below, and neglect base currents. What is
?
Answer:
2.
In the current mirrors below, neglect b
55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 06
Question 1 (1 point unless noted otherwise)
With respect to MOSFETs, the units of
(PMOS)
VA
VA
VA
AV
(a)
(b)
(c)
(d)
and
VA
1.
are (circle one)
(NMOS)
Answer: (a)
2.
I
55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 05
Question 1 (1 point unless noted otherwise)
1.
True or false: in IC circuits, transistors are often used to replace resistors, because IC realestate is expensive, and re
55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 04
Problem 1 (Quick Takes 1 point each unless indicated otherwise)
1.
Explain with one word/phrase what every letter in CMOS mean.
Complementary Metal Oxide Semiconductor
2
55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 03
Problem 1 (Quick Takes 1 point each unless indicated otherwise)
1.
True or false: when transforming a circuits diagram to a diagram of its smallsignal
model, we replace
55:041 Electronic Circuits. The University of Iowa. Fall 2011.
Homework Assignment 0 2
Question 1
a)
Define the CMRR for a differential amplifier. What is the ideal value? (2 points)
Answer:
b)
What is the purpose of
points)

 . Ideally,
in the circuit
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ECE:3410 Quiz 19
Question 1 Draw a smallsignal model for the amplifier and
then show that the output resistance is = (1 ) .
Assume that = 0 for the FET, and . (5 points)
Solution
The smallsignal model is shown along with a voltage source