to Introduction Microelectronic Circuits
EE40
Lecture 1
Josh Hug
6/21/2010
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A Story
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Integrated Circuit (Core i7 processor)
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Courtesy of Intel
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Integrated Circuits (Core i7 processor)
Almost 1,000,000,000 transistors
Features as small as a nanometer
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Then (C64, 1983) and Now (iPhone, 2010)
5000 nanometer process
1.023 MHz (CPU)
10,000s of transistors
160 x 200 x 16 color
display
$1300 dollars at release
(adjusted for inflation)
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45 nanometer process
1,000 MHz
100,000,000 transistors
320 x 480 x 262,144 color
display
$600 dollars at release
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Moores Law
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Electron Microscope view of MOS Transistor
Insulating Layer
(gate oxide) now
just 1.2 nm thick
For reference:
Human hair: 100,000 nm
Silicon atom: 0.1 nm
35 nm wide
In 10 years, we will hit a wall.
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Courtesy: Toms Hardware, June 11 2006 (65 nm process)
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Theres (still) Plenty of Room at the Bottom
Theres more than one way to build
a nanoscale information processing
unit Folklore
E coli is a 2000 nm by 500
nm device by area (in 3D,
500 nm tall)
Self-replicating, self-powered system
1 million interconnected subdevices of 4000
types
Stores 1 megabyte of genomic data
Humans are capable of building only a 10 bit
SRAM in the same area
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Painting of E. Coli courtesy of shardcore.org
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Even if we switch from MOS transistors
Integrated Circuits will be an important
technology for a long time
Designing and building these circuits
requires knowledge in many fields
Circuit analysis
Semiconductor physics
Chemistry
Computer microarchitecture
Signal processing
And many many more
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EE 40 Course Overview
EECS 40:
One of five EECS core courses (with
20, 61A, 61B, and 61C)
introduces hardware side of EECS
prerequisite for EE105, EE130, EE141, EE150
Prerequisites: Math 1B, Physics 7B
Course content:
Electronic circuits
Some very basic semiconductor
physics
Integrated-circuit devices and
technology
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EE40
Circuit
Input/Output
Response
Silicon
EE40
Circuit Modeling
EE105, EE130
Device Modeling
Copper
Device
Response
Other Materials
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Core EECS Courses (Computer Centric View)
Computer Programs
CS61C
61A/B
EE40
Computers
Integrated Circuits
Circuit models
Combinational and
Sequential Logic
State machines
EE40
CS61C
Transistors and
other devices
Buildable
Artifacts
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Silicon and other
materials
CS61C
EE20
Network Models
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Course Logistics
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Important Dates
Two or three in-class midterms
July 9th (18 days from now)
July 28th
August 11th (if you guys vote to do this)
One comprehensive final
August 13th
July 2 must be registered for course
June 25th last day to drop for a refund
July 30th last day to drop for no refund
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Grades
Reading Assignments (5%)
HW (20%)
Lowest HW dropped
One late homework allowed
Midterm and Final (20%, 20%, 20%)
If we do 3 midterms, lowest dropped
Labs (15%)
Six labs
Two lab projects
2nd project is open ended, get started early if you
want to do something crazy
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Reading Assignments
Reading assignments due before class
Easy problems to make sure you got at least
something out of the reading
Credit/No Credit grading
No late submissions allowed
Lowest two dropped
Submit on bspace (bspace.berkeley.edu)
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Homeworks
Homeworks due on either Tuesdays or
Fridays
Must be in the HW box, 240 Cory by 5 PM
Problems graded on a 0,1,2,3 basis
You do not get 1 point for writing the problem
down
Will be returned in lecture
Also available during my office hours
On the top page, right top corner, write your
name (in the form: Last Name, First Name)
Fine to discuss problems with others but
ALL WORK SHOULD BE YOUR OWN
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Homework Philosophy
Homework is where the real learning
happens, similar to practicing a musical
instrument
My homeworks are for a grade so that if you
perform poorly on midterms, it is evidence of
what youve accomplished outside of a
testing environment
Copying homework answers is tempting, but:
It is an unfair representation of your
accomplishments
You will be unprepared for midterms
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Labs
Labs start NEXT week
2 labs per week, 3 hours each
Labs
50% on Prelab and 50% on Report
Do prelabs BEFORE the lab
You must complete the prelab section before
going to the lab. The prelabs are checked by
the GSIs at the beginning of each session. If
prelabs are completed during the lab sessions, it
is considered late and 50% will be deducted
Lab reports are due exactly one week after
your lab is completed
Some make up labs will be scheduled
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Discussion Sections and Office Hours
Note that discussion section times have
changed, now only one hour:
Tuesday: 1-2 PM
Friday: 2-3 PM
Held in 293 Cory
Office Hours will be posted later today
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Textbook and i>Clicker
Our textbook is Foundations of Analog
and Digital Electronic Circuits, 1st edition
by Anant Agarwal and Jeffrey Lang
Also required is an i>Clicker
For submitting answers in class
Available at ASUC bookstore or online
ASUC will buy them for $30 (as of last
semester)
Will register them by serial # to your name
online (details on website soon)
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Lectures
We have a 2 hour lecture
Nobody on this earth is that entertaining
End of each hour peer instruction
Work on small problem in groups
Submit answer via i>Clicker
Go over problem
Take a break
Attendance isnt required, but reading
assignments for lecture ARE required
Lectures will be posted online
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i>Clicker Test
Lets test those i>Clickers
Question: Does your i>Clicker work?
A. Yes
B. No
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Course Website
Course website is at http://wwwinst.eecs.berkeley.edu/~ee40/su10/
Homeworks, midterm solutions, labs, and
anything else we want you to know will be
posted there
Bspace will be used for
Submitting reading assignments
Discussion board
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HW0
Mini-biography assignment
Due Wednesday
May submit either:
Online on bSpace (due at midnight)
In class (at beginning of class)
Our HW0 is available on the web under
our pictures
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Study Groups
Learning or working in a team works better
than alone
Reduces chance that you get stuck on
something minor
Helping someone else requires very deep well
organized knowledge of a topic
You learn best by teaching
Provides a chance to learn how to solve
problems more efficiently and with higher
accuracy
Gives immediate feedback on how you stand
on coursework comprehension
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Study Groups
In my obscenely difficult Graduate
Probability and Statistics Class, wed:
Start the homework early (like the day it came
out), and attempt all of the problems alone.
Meet a day or two before it was due
Go over every homework problem
Discuss our approach to each
Different person led on each problem
This is fine, but ALL WORK MUST BE
YOUR OWN. Do not copy.
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Extra Credit: EPA!
Effort
Attending office hours, completing all assignments,
turning in HW0
Participation
Attending lecture and voting using i>Clickers
Asking great questions in discussion, lab, and
lecture and making things generally more
interactive
Altruism
Helping others in lab or on the discussion board
EPA! extra credit points have the potential to
bump students up to the next grade level! (but
actual EPA! scores are internal)
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Course ProblemsCheating
What is cheating?
Studying together in groups is encouraged.
Turned-in work must be completely your own.
Common examples of cheating: running out of time on a
assignment and then copying an answer from a friend,
taking homework from box and copying, asking to borrow a
solution just to take a look, copying an exam question,
Both giver and receiver are equally culpable
Cheating points: 0 EPA, negative points for that
assignment / lab / exam (e.g., if its worth 10 pts, you
get -10) In most cases, F in the course.
Every offense will be referred to the
Office of Student Judicial Affairs.
www.eecs.berkeley.edu/Policies/acad.dis.shtml
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About Me (Josh Hug)
6th year graduate student
Research on Biological Systems
How Bacillus subtilis makes decisions
Math is the same as well use in this class
One day, maybe a Teaching Professor
My HW0 is available online!
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My Goal as an Instructor
To make your time in EE40 as
fun and informative as I can
Make lectures interesting and
timely
Bring out the beauty and make
clear the usefulness of the material
Give secrets to getting good
grades
To get a 7.0 with HKN
This is my first class, be gentle
Ill need your feedback as much as
possible
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Friday Lunch
Every Friday after class
Email me at least a day in advance so that
I am not overbooked
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Teaching Staff
GSI/TAs:
Onur Ergen
Cooper Levy
Readers/Lab Assistants:
Jonathan Lin
Tony Dear
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Topic 1
Fundamentals of Electronic
Circuits
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Topic 1
Outline
Electrical quantities
Charge, Current, Voltage, Power
The ideal basic circuit element
Circuit schematics
Sign conventions
Mostly a review of Physics 7B
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Etymology
The word electric is derived from the
Greek elektron (Latin electrum) denoting
amber.
It was discovered in ancient times that
when amber is rubbed it attracts feathers,
dried leaves, etc.
This is due to the amber becoming
charged (discovered much later).
These are the roots of our subject.
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Common Sense
If we take a AA battery and a paperclip
and connect the two terminals, it heats up
If we stick the same paperclip into the wall
outlet and get it to actually stay there, it
will heat up much more (and then melt)
This heat is due to the flow of electrical
current driven by the voltage provided by
the source
As electrons bump into neighboring electrons,
they get jostled around. This is exactly what
heat is
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Intuition Test and a break
We decide to stick a piece of wire in a nearby
electrical outlet to heat our room.
We have a choice of many different thicknesses
of wire to use. Assume that resistance scales
inversely with diameter of the wire, i.e.
Rwire=constant/diameter
Assuming our wire wont melt, if we wish to
maximize the amount of heat generated, which
wire should we choose:
A. The thinnest wire B. The thickest wire C. Some medium wire
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The Universe
Electric charges exert forces on other
electric charges, according to Coulombs
Law:
The part of the universe we care about is
made up of atoms composed of these
charges
Negative charges (electrons) orbiting a
positively charged nucleus in discrete (i.e.
quantum) orbits
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Atomic Structure
Electrons are organized into orbitals,
basically a nested set of shells
If you rememeber high school chemistry:
Neons electronic subshells: 1s22s22p6
The existence of these shells plays a key role in
conductivity. It is hard to give an electron to
someone with no room to hold it.
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http://www.iq.poquoson.org/6sci/atoms/neonA.gif
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Matter
Atoms agglomerate into solids, liquids,
and gases
Typically, most objects in the world are
neutrally charged
Exceptions: clouds in a thunderstorm, people on carpets in dry
weather, rubbed amber, plates of a charged capacitor, etc.
When there is an imbalance of charge,
there are forces (Coulombs Law)
Static cling
Current through a wire
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Classification of Materials: Insulators
Solids in which all electrons are tightly
bound to atoms are insulators.
e.g. Neon: applying an electric field will tend
to do little, because it is hard for an electron to
move in to your neighbors valence shell.
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CoM : Metals and Semiconductors
Solids in which the outermost atomic electrons
are free to move around are metals
Metals typically have ~1 free electron per atom
~5 1022 free electrons per cubic cm
Electrons in semiconductors are not tightly
bound, nor are they free, but can be easily
promoted to a free state
insulators
semiconductors
metals
Quartz, SiO2
Si, GaAs
Al, Cu
poor conductors
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excellent conductors
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Abstraction
Though a detailed quantum mechanical
formulation would be the most accurate
choice, it would be hard to use
Thinking of 1023+ atoms composed of
charged subatomic particles each with
their own individual state is too much
Well instead lump large objects like a
battery into more abstract Likewise, pieces
we will treat current as a bulk
flow of charges
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Current
Electrical Current is simply a measure of the net
amount of positive charge that passes a plane in
space per second in a reference direction
For convenience, the base unit is 1 Ampere,
which is 1.6x1019 charges/sec or 1 Coulomb/sec
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A Plane in Space?
Net amount of positive charge passing a
plane in space in a reference direction
Analogous to measuring river flow
Dont care how much total water is moving
throughout the entire length of a river
Do care about how much water is passing a
given point on the shore per second
Current = speed of water * cross section of
river
Cross section is the plane in space
We care about the plane perpendicular to flow
?
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Electric Current Examples
1.
105 positively charged hydrogen ions (each with
charge 1.610-19 C) pass the perpendicular plane in
space to the right (+x direction) every nanosecond.
What is the current to the right?
2.
105 electrons (each with charge -1.610-19 C) pass
the perpendicular plane in space to the right (+x
direction) every nanosecond. What is the current to
the right?
Current is net positive charges to the right, so
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Electric Current Summary
Definition: Rate of positive charge flow in
a reference direction
Symbol: I
Units: Ampere (A) = 1 Coulomb/second
Simply the net amount of charge/second
passing through a plane perpendicular to
the direction of flow
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Current Density
Definition: rate of positive charge flow per unit area
Symbol: J
Units: A / cm2
Example 1:
Wire attached
to end
Suppose we force a electron current of 1 A to
flow from C1 to C2, what is the current density:
Electron flow is in -x direction through 2cm2 cross section:
-0.5 A/cm2
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Voltage
The voltage between two points in
space is simply the amount of energy (in
Joules) that it would take to move 1
Coulomb of charge between those two
points
Example: There is a uniform electric field
pulling electrons to the left at 9.8
Newtons/Coulomb. How much energy
would it take to move this charge 2 meters
to the right?
Energy=Force*Distance
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Analogy to Gravity
Example: There is a uniform gravitational
field pulling some matter downwards at 9.8
Newtons/kg. How much energy/kg would it
take to move this matter 2 meters
upwards?
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Electric Potential (Voltage)
Definition: energy per unit charge
Symbol: v
Units: Joules/Coulomb Volts (V)
v = dw/dq
Alessandro Volta
(17451827)
where w = energy (in Joules), q = charge (in Coulombs)
Note: Potential is always referenced to some point.
a
b
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Subscript convention:
vab means the potential at a
minus the potential at b.
vab va - vb
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Electric Power
Definition: transfer of energy per unit time
Symbol: p
Units: Joules per second Watts (W)
p = dw/dt = (dw/dq)(dq/dt) = vi
Concept:
As a positive charge q moves through a
drop in voltage v, it loses potential energy
Voltage is Joules/Coulomb
Current is Coulombs/second
Power is the product of these
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Summary
So far:
Current: Number of positive charges per
second passing a plane in a particular
direction
Current density: Current per unit area
Voltage: Amount of energy per Coulomb to
move a charge between two points
Power: Amount of energy per second
Where do these quantities arise?
When we build networks of electrical
components
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Power Sources
We want to get charges moving in a
controlled fashion
Generate heat
Turn motors
Perform computation
Store entire corpus of written human work in
easily transmittable format
It is easier to build a source which
provides an almost constant voltage as
opposed to an almost constant current
(more on this later)
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Voltage Sources
One of the fundamental devices in
electrical engineering is the voltage source
Batteries
Generators
Provide a consistent voltage difference
between two points in space
If a charge is at the top of the voltage, a
force will try to move it towards the
bottom
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Voltage Sources
Positive and negative charges will move in
opposite directions given the same voltage
Positive terminal of a voltage source
High potential for a positive charge
Low potential for a negative charge
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Our First Circuit
Imagine that we have an ideal voltage
source connected to a piece of metal.
What happens?
Electrons at the negative terminal travel
towards the positive terminal
These electrons will encounter some
resistance as they travel generating heat
The current of the electrons will be a function
of this resistance and the original voltage
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Ohms Law
Ohm* discovered in 1825 that for many
materials, voltage and current are related
by a simple linear relationship: V=IR
Here the resistance is a bulk property of
the object connecting the two terminals of
a voltage source and is empirically derived
Measured in Ohms
Any material which obeys Ohms Law is
called a resistor
*: Cavendish was first in 1781, but didnt publish. Take note.
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Ohms Law
Ohms law doesnt always work
Consider your wall outlet with terminals
connected by a gaseous mixture of mostly
nitrogen and oxygen
There is no current flow
With a high enough voltage, called the
breakdown voltage, current will eventually
flow (via a spark, a.k.a. lightning)
Such phenomena are beyond the scope of
this course
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Circuit Schematics
Ohms law paved the way for simple circuit
schematics
We can model circuits as a series of
interconnected discrete components or
ideal basic circuit elements
For now, each component can be
characterized with a single physical
parameter
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The Ideal Basic Circuit Element
i
+
v
_
Polarity reference for voltage can be
indicated by plus and minus signs
Reference direction for the current
is indicated by an arrow
Attributes:
Two terminals (points of connection)
Device model gives us current/voltage
relationship (I-V Characteristic)
Cannot be subdivided into other elements
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Example Circuit Element: Resistor
Resistor: Circuit element where the voltage
across the element is linearly proportional to the
amount of current flowing through the device
i
+
v
_
v
i
The slope must be positive and the
characteristic must go through the origin.
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Example Circuit Element: Voltage Source
Voltage Source: Circuit element that maintains
a prescribed voltage across its terminals,
regardless of the current flowing in those
terminals
Voltage is known, but current is determined by the
circuit to which the source is connected
A battery can be approximated by a voltage source
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I-V Characteristic of Ideal Voltage Source
a
+
Vab
_
i
i
+
_
vs
i=0
v
b
Vs>0
Voltage is known, but current is
determined by the circuit to which the
source is connected
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Circuit Schematics
Combinations of ideal basic circuit elements
A (high resistance) paperclip connecting
the terminals of a 10 volt battery can be
schematically represented as shown below
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Larger Circuit Schematics
We can compose these components into an
arbitrary network
For much of the semester we will discuss how to
convert these networks into a system of algebraic
(and later differential) equations
The solution will give us the current and voltage
between any two terminals in an arbitrary network
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Example Problem Structure
Find the voltage V1 and current I2
Note that the problem statement assumes a
certain reference direction for currents and
voltages
If you find that the reference direction is
wrong, just note your answer as negative
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Reference Example
Find the current I1
I1
Magnitude of the current is obviously 10V/100 or
0.1 Amps.
Current flows from positive to negative, so
reference current is wrong. Answer is -0.1 Amps
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Reference Directions and Sign Conventions
The minus sign is just shorthand for its
going the other way than the one you
asked for
Like asking how fast is your plane moving
in the direction of New York? when youre
flying away from New York
Could say 500 mph, but the other direction
Or just minus 500 mph
If you get confused on sign conventions at
any point in the course, just step back and
think about what is reasonable
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Sign Convention Example
Suppose you have an unlabelled battery and you
measure its voltage with a digital voltmeter (DVM).
It will tell you the magnitude and sign of the
voltage.
With this circuit, you are
measuring vab.
The DVM indicates 1.401, so
va is lower than vb by 1.401 V.
+
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Which is the positive battery
terminal?
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Sign Convention for Power
If P > 0 for a circuit element
Consuming power (as heat, light, motion, etc)
If P < 0 for a circuit element
Providing power
Resistors always consume power
Voltage sources may consume or provide
power
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Sign Convention for Power
Remember earlier that we said P=VI
This can be problematic depending on the
chosen reference directions
+
V1
I1
P=VI=10 V * (-0.1 Amps) = -1 Watt
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Resistor providing
power??
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Sign Convention for Power
Well have to revise P=VI to take into
account this reference direction problem
+
V1
I1
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Sign Convention for Power
Passive sign convention
p = vi
p = -vi
i
+
v
_
i
_
v
+
Current from + to
i
+
v
_
i
_
v
+
Current from to +
If p > 0, power is being delivered to the box.
If p < 0, power is being extracted from the box.
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Sign Convention for Power
For this circuit, since reference current is
in the opposite direction of reference
voltage in the resistor, then P=-VI
+
V1
I1
P=VI=-10 V * (-0.1 Amps) = 1 Watt
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All is well
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Summary
Current = rate of charge flow
Voltage = energy per unit charge created by
charge separation
Power = energy per unit time
Ideal Basic Circuit Element
2-terminal component that cannot be sub-divided
Described mathematically in terms of its terminal
voltage and current
Circuit Schematics
Networks of ideal basic circuit elements
Equivalent to a set of algebraic equations
Solution provides voltage and current through all
elements of the circuit
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iClickers Once More
We decide to stick a piece of wire in a nearby
electrical outlet to heat our room.
We have a choice of many different thicknesses
of wire to use. Assume that resistance scales
inversely with diameter of the wire, i.e.
Rwire=constant/diameter
Assuming our wire wont melt, if we wish to
maximize the amount of heat generated, which
wire should we choose:
A. The thinnest wire B. The thickest wire C. Some medium wire
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Acknowledgements
Dan Garcia, Babak Ayazifar, Mike Clancy
for help in CS302 (a course in course
design)
Slides and Course Organization:
Tsu Jae King
Connie Chang-Hasnain
Octavian Florescu
Brian Gawalt
Bernhard Boser
Labs
Bernhard Boser
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Extra Slides
Extra slides youre responsible for knowing
about, but which I wont talk about in class
for lack of time
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EE40 Content (Detailed Version)
Fundamental Circuit Concepts and Analysis Techniques
Networks of power sources and resistors
Op-amps
Signal amplification
Conversion of circuit schematics into algebraic equations
Circuits with Energy Storage Elements
Capacitors
Inductors
Filtering
Conversion of circuit schematics into differential equations
Semiconductors and Integrated Circuits
Basic semiconductor devices
Diodes
Transistors
Logic gates
Textbook
Foundation of Analog and Digital Electronic Circuits, Anant
Agarwal and Jeffrey Lang, Morgan Kaufman, 1st Edition
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Final Grade Distribution subject to change
before first midterm
Grading: 800 pts total
120pts = 15% Labs
160pts = 20% Homework
320pts = 40% Two midterms (each 20%)
160 pts= 20% Final
40 pts = 5% Reading Assignments
+ Extra credit for EPA. Whats EPA?
Grade distributions
Pseudo-Absolute Scale
Perfect score is 1000 points. 25-60-25 for A+, A, ASimilar for Bs and Cs (110 pts per letter-grade)
C+, C, C-, D, F (No D+ or D- distinction)
Exception: No F will be given if all but one hw and labs are
completed and all exams taken
Well ooch grades up but never down
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Weekly Calendar
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Core EE Courses
Input Signals
Systems Modeling
System
Architecture
Circuit
Input/Output
Response
Silicon
EE20
EE40
Circuit Modeling
Device Modeling
Copper
EE40 Summer 2010
Output
Signals
Other Materials
Device
Response
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