I. CATALOG DESCRIPTION:
ET161 Linear Electronics C 2, P 2, CR 3
The theory and applications of modern transistors are introduced; both the bipolar junction transistor and the field effect transistor are examined. Applications include usage in small and large signal class A amplifiers, as well as in class B power amplifiers. Voltage control FET applications are studied. Problem solving techniques involving digital computers are discussed.
Corequisites: ET152 Circuits 2.
Tools: Scientific calculator, electronic hand tools and breadboard
III. STUDENT LEARNING OUTCOMES:
The student will demonstrate familiarity with the operating principles and linear applications of bipolar and field effect transistors.
The student will demonstrate a working knowledge of the basic theory of device operation, how to properly bias devices, and have an understanding of common circuit applications including small and large signal audio amplifiers.
The student will use a mathematical and problem solving approach for design and analysis, based on fundamental DC and AC circuit principles and math concepts. This will include the use of computer simulations.
The student will demonstrate facility at constructing and trouble shooting transistor circuits in the laboratory with proper use of test equipment.
The student will demonstrate appropriate communication skills, particularly technical reports through the laboratory.
The student will demonstrate the ability to work as part of a technical team, particularly in the laboratory.
Course Assessment Standards
Success in this course requires a good working knowledge of DC circuit principles, especially KVL and KCL. Thevenin and Superposition theorems are used quite a bit, although mesh and nodal analysis are generally not used. A basic working knowledge of diodes is assumed. AC analysis generally assumes "mid-band" frequencies, and thus phase is not usually considered (i.e., no complex impedances as found in ET152 Circuits 2). Math level is mostly algebra, although some equation proofs do require differential and/or integral calculus (not required for day-to-day calculations). Smart devices will not be allowed during tests. For lab, you'll need the standard array of goodies as used in ET151 Circuits 1 and ET153 Intro to Electronics (breadboard, DMM, small handtools, hook-up leads, etc.) Unless otherwise specified, all lab exercises require a technical report due no later than one week after the exercise. Late penalty is one letter grade for the first half week, two letter grades for the second half week. Reports are not accepted beyond two weeks and receive a grade of 0. Remember, plagiarism is grounds for failure.
Free on-line resources covering a variety of electrical circuit topics and reference material may be found at: www.allaboutcircuits.com and www.talkingelectronics.com, in particular, check out this extensive free e-book that covers everything from basic semiconductor theory through diodes, transistors, amplifiers, modulation, power electronics and digital electronics, in nearly 800 pages. Also, here is an extensive on-line text from Analog Devices. See the home page for free circuit simulators.
The humorously inclined might enjoy Britney Spears' Guide to Semiconductor Physics
progress and assignments.
We begin with an introduction to BJTs and the CE connection. This includes basic device parameters alpha and beta, and other data sheet items, simple DC BJT model, the need for biasing, simple biasing circuits (e.g., base bias) simple base biasing, DC load lines and saturation limits. We also look at LED driver circuits. Toward the end of the week we'll be looking at other forms of bias, including voltage divider bias and two-supply emitter bias.
We continue with bias variations, load lines, DC coupled circuits and PNPs.
We finish biasing. Once this is done, we'll have the first test.
We tidy up biasing (going over the test) and introduce AC models and equivalent circuits. This is where the circuits start to get interesting. Biasing is sort of like learning how to make a car engine idle. Now it's time to start driving. We'll spend the next couple of months looking at small signal and large signal (i.e., power) amplifier circuits.
Our initial concern involves finding voltage gain, input impedance, and output impedance for typical voltage divider and dual supply emitter bias circuits. From here we will also look at the effects of source impedance and loads, and perhaps examine a few other biasing types for comparison.
We continue with small signal AC analysis, introducing multi-stage schemes and direct-coupled circuits. If time permits, we will introduce emitter followers and darlingtons (otherwise, it gets bounced to next week).
We finish small signal work and we introduce large signal amplifiers. Finally, we get to drive loudspeakers.
We continue work on class A amplifiers including AC load lines, load power, device ratings, efficiency, etc. Once this is done we have our second test.
We start class B amplifiers. We pay particular attention to its advantages and disadvantages relative to class A operation.
Work on class B is wrapped up, including circuits utilizing direct coupled drivers and loads.
We begin Field Effect transistors, first with how JFETs differ from BJTs, and then we launch into JFET biasing.
JFET biasing is completed and AC amplifiers are introduced.
We finish JFETs and start with MOSFET circuitry, paying attention to the differences between MOSFETs and JFETs.
We wrap up with MOSFETs and look at a few interesting FET applications. Time permitting, we have our last in-class test.