Course Description
2008 (summer) - Electronics II
| Course Code: | 2008 |
| Course Title | Electronics II |
| Academic Year: | 2005 |
| Semester: | Summer |
| Lecturer: | Dr. P. Cooke |
| E-mail Address: | pcooke@eleceng.adelaide.edu.au |
Aims:
This course aims to bring an understanding of::
Linear Circuit Analysis: Revision of circuit elements and analysis techniques, differential equation description of circuits, response under different excitations, Laplace transform techniques and transfer function description and analysis of mutual coupling.
Electronic Components: The structure, characteristics and modelling of diodes, bipolar transistors and field effect transistors, single transistor amplifiers, multistage differential and power amplifiers and operational amplifiers, in the analog processing of electronic signals, with ideal characteristics and practical limitations..
Three experiments plus the Audio Project in the course Experimental Electrical Engineering IIalso illustrate some practical aspects of this syllabus.
Outcomes:
After passing the course, students should be able to use and develop transfer functions, calculate responses under different electronic excitations, understand amplifier specifications, analyse simple amplifier circuits, describe the origin of non-ideal amplifier behaviour, calculate the effects of such behaviour in practical amplifier circuits, provide an outline of the internal construction of operational amplifiers, and design a variety of filter circuits employing operational amplifiers. Students will also be conversant with basic biasing techniques for transistor amplifiers.
Previous Studies:
This course requires a knowledge of Electrical Systems A (5576) and Electrical Systems B (4249).
Further Studies:
The course provides a basis for more advanced studies in electronics at Level III in Electronic Design IIIand Experimental Electrical Engineering III, establishes principles frequently useful in project work at Level III and Level IV, and introduces concepts required by many Level IV lecture courses.
Delivery methods:
24 lectures and 12 tutorials for a duration of 6 weeks, to be held Tuesdays, Thursdays and Fridays 11:00 - 1:00pm in the Chapman theatre. Within this period there will be problems comprising theoretical and computational aspects of the work. These assignments will be due by the next morning's session.
Assessment:
The assessment will consist of two components
Examinations 70%Assignments 30%.
There will be a 3-hour closed-book examination held on Thursday, 17th February 2005 at a time and venue to be advised.COURSE OUTLINE : ELECTRONICS II
Revision of circuit elements and analysis techniques
Symbol Conventions, passive components, steady state and transients, independent sources, dependent sources, amplifiers. Current, voltage, transconductance and transresistance amplifiers.
differential equation description of circuits
Kirchhoff's Voltage law, Kirchhoff's current law, mesh analysis, nodal analysis.
response under different excitations
Unit ramp, unit step, delta function. First order RC and RL circuits, state variables, integrators, time constants, second order circuits, series RLC, parallel RLC, damping, steady state and transient solutions.
Laplace transform techniques
Complex exponential signals, impedance, admittance, s = j w, transfer function.
transfer function description
Properties of transfer functions
analysis of mutual coupling.
Diodes
The ideal diode; terminal characteristics of junction diodes; analysis of diode circuits; the small-signal model and its application; operation in the reverse breakdown region - Zener diodes, rectifier circuits; limiting and clamping circuits; physical operation of diodes - basic semiconductor concepts; the pn junction under open-circuit conditions; the pn junction under reverse-bias conditions; the pn junction in the breakdown region; the pn junction under forward-bias conditions.
Bipolar junction transistors (BJTs)
Physical structure and modes of operation; operation of the npn transistor in the active mode, the pnp transistor, circuit symbols and conventions; graphical representation of transistor characteristics; analysis of transistor circuits at dc; the transistor as an amplifier; small-signal equivalent circuit models; graphical analysis; biasing the BJT for discrete circuit design; basic single-stage BJT amplifier configurations; the transistor as a switch-cutoff and saturation; complete static characteristics and second-order effects. Circuit, simple transistor model, analysis using simple transistor model; example; circuit improvements.
Differential and multistage amplifiers
The BJT differential pair; small-signal operation of the BJT differential amplifier; other non-ideal characteristics of the differential amplifier; biasing in BJT integrated circuits; the BJT differential amplifier with active load; the JFET differential pair, MOS differential amplifiers.
Output stages and power amplifiers
Classification of output stages; class A output stage; class B output stage; class AB output stage; biasing the class AB circuit; power BJTs; variations on the class AB configuration.
Field-effect transistors (FETs)
Structure and physical operation of the enhancement-type MOSFET; current-voltage characteristics of the enhancement MOSFET; the depletion-type MOSFET; the junction field-effect transistor (JFET); FET circuits at dc; the FET as an amplifier; biasing the FET in discrete circuits; basic configurations of single-stage FET amplifiers; integrated-circuit MOS amplifiers; FET switches; Gallium Arsenide (GaAs) devices - the MESFET.
The ideal operational amplifier
The terminal view; the inverting configuration; more accurate analysis; the inverting integrator; the inverting differentiator; the inverting summer; the non-inverting amplifier; the voltage follower; a difference amplifier with finite gain; voltage to current converter; negative impedance converter; and the general impedance converter.
Non-ideal operational amplifier characteristics
Finite open loop gain and bandwidth; closed loop response for an inverter; closed loop response for a non-inverting amplifier. Internal structure of operational amplifiers: block diagram; simplification using Miller’s theorem. Exercise on practical amplifier. Large signal operation: saturation; slew rate; full power bandwidth. Common mode rejection amplifiers and circuits. Input resistance; output resistance; offset voltage; input bias currents; their effect upon offset, and necessity for dc input path.
Operational amplifier internals
Schematic circuit; section identification; bias; transconductance amplifier; voltage amplifier; feedback capacitor; output current limiting; output buffer. Identification of those sections in a 741 operational amplifier.
REQUIRED TEXT
R.C. Dorf and J. A. Svoboda, "Introduction to Electric Circuits" (Wiley, 2001, 5th edn)
REFERENCE TEXTS
Hambley, "Electronics 2/E" (Prentice Hall, 2000)
Sedra and Smith, "Microelectronic circuits" Saunders College Publishing (Oxford), Sydney.
NOTE
The above is subject to revision.
