SOLUTIONS CHAPTER 1
1.1.
Show that Equation (1.6) follows from Equation (1.3).
q2
Solution: Equation (1.3) is dEP =
dr . Integrating both sides we obtain
4 0 r 2
1
q2 1
q2
q2
dEP =
dr =
dr =
+ const = EP
2
2
4 0 r
40 r
4 0 r
To find the constant, we e
SOLUTIONS CHAPTER 2
2.1. Of the two materials whose E-K diagrams are shown in Figure P2.1, which
will have the lowest effective mass for electrons? Which will have the lowest
effective mass for holes? Explain how you arrived at your conclusion.
E
E
C
E
E
Solutions Chapter 3
3.1. Calculate the speed of an electron in Si with kinetic energy 0.013 eV. Draw
an equilibrium energy band diagram for silicon and indicate where this
electron will be. Compare your calculated thermal speed to the typical drift
veloci
Chapter 4 Solutions
4.1. Consider a p-type Si sample of length 0.1 m in which the net doping varies
exponentially from 51017 to 51015. Find the electric field.
Following the example of Section 4.2.2,
and =
x x0
N ' (x )
= ln A' 0
N A (x )
( x x0 ) = (
ECE561: Digital Circuit Design
Winter 2012
Homework #2 - Solutions
1. Modulo 64 counter using two 163 and one 139
5V
CLR
CLR LD
QD
C
B
QB
B
A
QA
D
C
CLK
QD
D
QC
LD
74163
QC
74163
QB
QA
A
B
A
CLK
RCO
RCO
EnP EnT
EnP EnT
5V
Y0
74139 Y1
Y2
Y3
G
5V
2. The cou
ECE 561
Homework #4 Solutions
1. Problem 1: (Problem 5.3 of the textbook)
library IEEE;
use IEEE.std_logic_1164.all;
entity alarm is
port (PANIC, ENABLE, EXITING, WINDOW, DOOR, GARAGE:
in STD_LOGIC; ALARM: out STD_LOGIC);
end alarm;
architecture alarm-a o