B. OLSON
ECE 220
Homework7- solutions
1)
a) Determine Vo and the mode of operation that the MOSFET is in when: Vin=.2V
Vin = Vgs < VTN
=> Cutoff
=>Vo = 3.3V
b) Determine Vo and the mode of operation t
B. OLSON
ECE 220
Homework 8 SOLUTIONS
Small Signal Problems
1)
dIc
d
dVCE dVCE
I
Vce 1
V /V
I S eVBE / VT CQ
I C I S e BE T 1
V A V A
VA
2) An amplifier is characterized as follows:
Gm = -10mA/V
R
B. OLSON
ECE 220
Homework 8
Small Signal Problems
1)
Show that for a BJT
I CQ
1
dIc
for a given Q-point. You may assume that VBE is a constant
ro dVCE V A
Vce
Vce
and I CQ I S eVBE / VT 1
I S e
B. OLSON
ECE 220
Homework 2-SOLUTIONS
Rectifiers
1) For the circuit shown assume a sinusoidal voltage with an amplitude of 4Volts centered at DC is applied to the
circuit shown below (Vs = 4 sin(2 f t
B. OLSON
ECE 220
Homework6- solutions
1)
a)
b)
c)
d)
MOSFETS
For NMOS transistors Vs < Vd. The terminals on the bottom are all sources
Vg
(V)
1
1.2
2
1.4
Vs
(V)
0
1
.5
.5
Vd
(V)
.2
2
1.2
1.6
Vgs
Vgs <
B. OLSON
ECE 220
Homework 7
1) (some are tricky) For the amplifier below assume: Kn = 200uA/V 2, VTN = .7V
Suggested strategy: Make an educated guess and verify your guess
a) Determine Vo and the mode
B. OLSON
ECE 220
Homework 6
MOSFETS
1) Assume that VTN = .7V. Determine the mode of operation for the transistors shown
0 .2 V
1V
2V
1 .2 V
0V
1V
(a)
2)
1 .2 V
1 .6 V
2V
(b)
1 .4 V
0 .5 V
0 .5 V
(c)
(
B. OLSON
ECE 220
Homework 6 - SOLUTIONS
Amplifier Biasing
1) For the amplifiers shown, determine the bias resistors necessary to achieve the desired operating point. You
may assume that VBE(ON) = .7 a
B. OLSON
ECE 220
Homework 4 SOLUTIONS
Bipolar Junction Transistors IV curves (contin)
You are responsible for being able to draw the IV curves that we go over in class and identifying the mode of oper
B. OLSON
ECE 220
Homework 6
Amplifier Biasing
1) For the amplifiers shown, determine the bias resistors necessary to achieve the desired operating point . You may
assume that VBE(ON) = .7 and = 100
(a
B. OLSON
ECE 220
Homework 3 - SOLUTIONS
Load Line Analysis
1)
a) Write an expression for the load line
(10V- 2V - VD)/R1 = ID
(8V-VD/1K=ID
b) Draw a graph showing the Q-point, the load line, and the c
B. OLSON
ECE 220
Homework 4
Bipolar Junction Transistors IV curves
You are responsible for being able to draw the IV curves that we go over in class and identifying the mode of operation
1) An npn tra
B. OLSON
ECE 220
Homework 2
Rectifiers
1) For the circuit shown assume a sinusoidal voltage with an amplitude of 4Volts centered at DC is applied to the
circuit shown below (Vs = 4 sin(2 f t). Sketch
B. OLSON
ECE 220
Homework 3
Load Line Analysis
1) For circuit shown
a) Write an expression for the load line
b) Draw a graph showing the Q-point, the load line, and the curve for the diode
10V
1K
Vo
2
B. OLSON
ECE 220
Homework 1
1)
For the circuit shown
b) Determine the voltage across the diode (VD), Vo and the current through the diode (ID)
an ideal diode model
c) Determine the voltage across the
California State Polytechnic University, Pomona.
Electrical and Computer Engineering Department
ECE 220
Homework #1
For each problem below: Explain each step in your solution and
what the problem impl