In Class Questions about MOSFET Transistors
1. The source of a p channel MOSFET is (negative, positive) relative to the drain, and the
current in the wire connected to the drain flows (toward, away from) the transistor.
2. A p channel MOSFET is turned on
The circuit below is called a voltage divider.
100 Volts = VR1 + VR2 .
R1 & R2 divide up the 100 volts. Each gets part of it. Its easy to calculate how much voltage
each gets. We assume that the volt meter does not draw any current, so al
Circuits & Electronics Homework 5
Due Tuesday, April 2
A silicon diode has I0 = 2.0 x 10-9 Amps & = 1.2 . Graph iD versus VD for
0 VD 0.8 volts at room temperature (300 degrees Kelvin). Show your calculations.
Calculate VOUT for the following circui
Circuit Facts to Remember
The following is a list of important facts about circuits to remember when you are analyzing a
circuit. Keeping these in mind will help a great deal when trying to understand a circuit.
1. The current is the same everywhere in a
Circuits & Electronics Homework 6
Due Tuesday, April 16
For what value of Vin is VCE = 0.2 volts for the following circuit? Assume = 150 for all
For what values of Vin is the transistor of problem 1 saturated?
Graph Vout versus Vin for
In Class questions about semiconductors & pn junctions
1. Donor atoms produce (conduction electrons, holes) in a semiconductor, and the donor
atoms end up having a (positive, negative) charge.
2. Acceptor atoms produce (conduction electrons, holes) in a s
Circuits & Electronics Homework 7
Due Thursday, April 25
An n channel JFET has IDSS = 15 ma and VP = -4 volts. Graph iDrain versus VDS for
VGS = 0, -2, & -4 volts. Calculate & plot points for VDS = 0, 1, 2, 3, 4, 5, & 6 volts on
each curve. Put your ca
Circuits & Electronics Homework 8
Due Thursday, May 2
All questions apply to the following circuit. The transistor parameters shown are for the n
channel transistor. Assume VT of the p channel transistor is -1 volt. Notice that Vin = 5 volts.
In Class Questions about Bipolar & JFET Transistors
1. A saturated transistor has its collector junction (forward, reverse) biased. Its collector is
(positive, negative) relative to the base.
2. A bipolar NPN transistor can be modeled using two diodes and
A battery can be thought of as a voltage source. A 12 volt battery always has 12 volts higher
voltage on the positive terminal than the negative. The voltage is independent of the current
through the battery as long as the current is not t
Miscellaneous Course Information
Circuits & Electronics
MWF @ 9:00 am and Tuesday @ 2:00 pm
Fundamentals of Electrical Engineering & Technology by William D. Stanley, John R.
Hackworth, & Richard
Meters & Ground
A volt meter measures the difference in voltage between the red lead and the black lead.
It measures VRed VBlack .
(Show them one.)
This meter will show VRed VBlack = VB VC = VBC = (10K) i .
Well see in a minute that i = 3.333
Some substances are insulators. A battery will not make detectible current flow through them.
Many substances (lead, iron, graphite, etc.) will let current flow.
For most substances that are not insulators, the current is approximately proportio
Transistors Part 2
This lecture covers the following topics: transistor , saturation & cutoff, transistor curves &
Load Line analysis, & transistors as switches.
= iC / iB
= iC / iE
Alpha is defined as the ratio of collector current to emitt
Pure silicon is almost an insulator. Its a semi-conductor.
The valence of silicon is 4, the same valence as carbon. Its just below carbon in the periodic
The silicon crystal has the same structure as diamond. Its tetrahedral;
All circuits have capacitance whether you want them to or not. In most circuits the capacitance
determines the speed of the circuit. A computer spends most of its time charging & discharging
capacitances in the circuit (gate capacitance & junct
MOS Field Effect Transistors (MOSFETs)
MOSFETs are used in most digital integrated circuit chips. MOSFETs are very small, and use
very little power. This makes it possible to put more than a billion MOSFETs on a chip less than
1 cm square. Nearly all of t
Transistors are the magic of electronics. Transistors make possible things like radios,
televisions, computers, the internet, etc. The reason transistors are so important is that they make
When a radio wave strikes an ante
The purpose of this lecture is to give you an overview of the actual definition of voltage. If you
have trouble following some of the details, do not be concerned. If you understand the main
ideas and remember the main results, that will be sufficient.