ENEE 303 (Horiuchi)  Exam #1 SOLUTIONS
E1) The pnjunction diode
a) (1 pt) In the pnjunction diode, there are two capacitances that affect highfrequency operation. What are the
names of these two c
ENEE 303 Midterm Exam 1
Solution
1. Shows that for the inverting amplifier if the opamp gain is A, the input resistance is given by
= 1 +
2
+1
R2
ii
vi
R1
v
vo
v+
Fig. 1
Solution:
= = 2 (5 )
2 =
Homework #1 ENEE 303
(Horiuchi, Fall 2011)
Due: Tuesday, Sept 6th, 2011 (in class)
Your goal in the homework is to both explain to me how one solves the problem and to solve for the
actual answer. Cor
HW1 solns sheet Horiuchi
(1) Note that the wire in the center can have current running through it, but it will be all at the
same potential. Lets call the potential on this node, Vx. In this problem,
ENEE 303 (Horiuchi) Exam #1 SOLUTIONS
In this exam, we will be ignoring the Early effect and the body effect.
E1) CV diode model
Use the CV model of the diode with a threshold voltage of V0
Homework #2 Solutions
ENEE 303
Problem 1  If a diode passes 0.6 mA at 0.681v, then we can solve for Is.
0.600mA = I s e
0.681
25.8 mV
Is = 2.06E15 A
We know that the current will be less then 1mA be
ENEE 303 Homework #10 Solution Set
1) 1 pts In the circuit on the right, a current I flows into the transistor. If we know Is, for the
transistor, give the formula describing the voltage V in term
HW #1 solutions sheet Horiuchi
(1) Note that the wire in the center can have current running through it, but it will be all at the same potential.
Lets call the potential on this node, Vx. In this pro
ENEE 303 (Horiuchi)  Exam #2
Some helpful equations
iC = I S e
vBE
VT
g m = kn '
,
=
+1
iB + iC = iE
,
ln(ab) = ln(a) + ln(b) , I D = kn '
W
1 2
( vGS Vt ) vDS 2 vDS
L
W
(VGS Vt ) , r = / g m , re
ENEE 303 (Horiuchi) Exam #1 Solution Set
E1) CV diode model
Use the CV model of the diode with a threshold voltage of VD0.
1a) (1 pt) Solve for the inequality that indicates when D1 is conduc
Homework #5 ENEE 303
(Horiuchi) Solution Set
1) 1 pts In the circuit on the right, a current I flows into the transistor. If we know Is, for the
transistor, give the formula describing the voltage V i
ENEE 303: Analog and Digital Electronics
Spring 2015, Homework 1
Due Date: Feb. 12th, 2015, 11:00am in the class.
1. A noninverting amplifier configuration, with finite opamp openloop gain A, is sh
Homework #1 ENEE 303
(Horiuchi, Fall 2014)
Due: Tuesday, Sept 9th, 2014 (in class)
Your goals in the homework are to: 1) explain to me how one solves the problem, and 2) to solve for
the actua
ENEE 303  Homework #4 Solution Set
1) 1 pts In the circuit on the right, a current I flows into the transistor. If we know Is, for the
transistor, give the formula describing the voltage V in terms o
Homework #8 ENEE 303 (F2010)
Problem 1 Input resistance
Commondrain amplifier
va
ia
Rin =
Rin =
ia =
1
va va
1
+
= va +
R1 R2
R1 R2
va
1
=
= R1  R2
1
1
ia
+
R1 R2
Commonsource amplifier
Rin =
v
Homework #8 (Horiuchi) Fall 2013 Solution Sheet
Vdd
Due: Tuesday, November 19, 2013 (in class)
M2
3*IB
V2
Problem #1 folded cascode
(3 pts) In the circuit on the right, V1, V2, and V3 are all f
Homework #4 DC Biasing of nFETs
ENEE303 (Horiuchi)
9v
Problem 1 (2 pts) inverting amplifier
1a) (1.5 pt) In the nFET circuit on the right, if we want to pull V2 down to the
edge of saturation,
ENEE 303: Analog and Digital Electronics
Spring 2015, Homework 2
Due Date: March 10, 2015
Problem 1. For the circuits shown in Fig. 1 using ideal diodes, find the values of the
labeled voltages and cu
Homework #7 MOSFETS
ENEE303 (Horiuchi)
9v
Problem 1  MOSFET
(1pt) In the MOSFET circuit on the right, if we want to pull V2 down to the
edge of saturation, what gate voltage will we have to apply? kn
ENEE 303: Analog and Digital Electronics
Course Outline, Spring 2015
Instructor: Alireza Khaligh
Office: 2347 A.V. Williams; Tel: 3014058985;
EML: [email protected]; URL: http:/khaligh.umd.edu
Gra
_
P
I
i
A
5.10 L
0.25 jim
=
5.50
6
=
2
Ii n
(a)
460
0
C
2
ro )
,3
+2.5V.
vs
345 pF/rn
=
=
460 x
=

0.25mA
R
6nm
5.75 x io
=
+1 .8V.
m
k
0
C
= ji
(b)For
=
265 (A)/v
2
=
20,k
=
5.29 mA/V
2
+1 .OV.
.0.8
I
_/_1
13.3
MH
1
V
VOh
=
VDD
8
O.
,
1
V
NML
(04
VOL
width of transition region
V,.H
=
DD
61
0.1 )VDD
_
,
0
O.3V
00
O.2V for a minimum NM of
VIL
lv =O
VDD
2
I
5 V
VDD
!i:
13.23
Note that this question
ENEE 303 Homework 4
Problem 1. Consider a CMOS process for which Lmin 0.25 m, tox 6nm,Vt 0.5V and
n 460cm2 / V s .
(a) Find Cox and k n .
(b) For an NMOS transistor with W / L 15 m / 0.25 m , calculat
ENEE 303 Homework 3
Problem 1. Consider an npn transistor operated in the active mode and represented by the model
of Fig 1(a). Let the transistor be connected as indicated by the equivalent circuit s
ENEE303 Homework 5
Due date: 05/08/2017 (Before class)
1. (Homework problem from lecture)
The NMOS and PMOS transistors in the circuit of Fig. 1 are matched, with kn (Wn/Ln) =
kp(Wp/Lp) = 1mA/V2 and V
ENEE 303 Midterm Exam 2 Solution
1. Explain NMOS operation modes and provide iD equations in each operating mode. (20 points)
Solution:
a) Cut off region
When VGS < Vth.
The transistor is turned off.
ENEE 303 Homework 1 Solution
Problem 1.
(a) In order to find out the input resistance Rix, we need to place a test signal vt in the input
terminal and try to find out the test current it. The input re
ENEE303 Homework 1 Solution
Due on: Feb. 15 13:45
1. The circuit in Fig. l utilizes an ideal op amp.
(a) Find 1;, 12, [3, IL, and Vx.
(b) IF V0 is not to be lower than 13 V, nd the maximum allowed va
Homework 4
Due date: 04/19 Wednesday before class
1. Design the circuit in Fig. 1 to establish a current of 1 mA in the emitter and a voltage of 1
V at the collector. The transistor has VEB = 0.64V at
ANALOGUE ELECTRONICS I (EBB 2013)
TUTORIAL 3
QUESTION #1:
For the commonemitter amplifier shown in Figure Q1, replace the circuit with its hybrid
model and derive the input resistance, Rin, voltage