EE415 - Advanced Electronic Design



Overview

This class is primarily about collecting all the components of other classes and merging them together.  There are a lot of different components and aspects of circuit design that you have worked with by now; this class will advance your skills and knowledge of how to combine these pieces.




Materials

This class will stretch your design skills.  The labs and project do not tell you which parts to use (there are a few "start with this" kind of statements).  You are primarily responsible for selecting parts and designing circuits to fit given criteria.

LAB 1: Design, build, test, and demonstrate an integrator and a differentiator using a single op-amp for each.  Include SPICE simulations.  The input to the integrator will be a symmetrical square wave (50% duty cycle, +/-10V), and the output will be a 10V P-P triangle wave.  The input to the differentiator will be a 10V P-P triangle wave, and the output will be a +/-10V square wave.  Ideally, you will also connect the output of your integrator to the input of your differentiator, and the square wave that is input into the integrator should (mostly) match the output from the differentiator.

LAB 2: Design, build, test, and demonstrate a phase-shift oscillator at 200Hz and 25kHz.  Next, build Wein-Bridge oscillators for 200Hz and 25kHz.  Finally, build a Voltage-Controlled Oscillator (VCO) (use the CD4046) with a peak frequency of 80kHz and a bottom frequency of 20kHz.

LAB 3: Design, build, test, and demonstrate a curve-tracer.  Use a 555 timer chip to control a 1kHz ramp generator, whose output will drive the collector of the NPN transistor device under test (DUT).  Use an R-2R ladder to build a D/A Converter to generate at least 4 discrete voltages to drive the base of the DUT.  A small resistor is placed between the emitter of the DUT and ground to measure the collector current.  Use the collector current to drive the Y-Axis and the ramp generator to drive the X-Axis of an oscilloscope to observe the transistor's characteristic curves.

LAB 4: (OPTIONAL) Design, build, test, and demonstrate a 4-quadrant multiplier such that the output is the product of X and Y inputs, allowing X and Y inputs to be both positive and negative values.  For partial credit, build a 1-quadrant multiplier demonstrating X*Y=e^(ln(X)+ln(y)).

PROJECT: Design, build, test, and demonstrate a simple PLL communication device.  Start with the VCO you wbuild for LAB 2, but bias the input such that the VCO is operating near it's center frequency (60kHz).  On a separate breadboard, build another VCO, using the phase comparator of the CD4046.  Use the output from the LAB 2 VCO to send a signal to the input if the PLL.  The output from the PLL is listed as "Demodulated Output" on the 4046 chip.  Using a signal generator, add a square wave to the input if the LAB 2 VCO, and you should observe a square wave output from the PLL.  Change the input from a square wave to a triangle, ramp, and sine wave, and observe the PLL output of each.  Finally, (if available), add the output from a CD player/mp3 player/computer audio output to the input of the VCO, and observe the output from the PLL.




Lecture Material

Many of the lecture topics seem somewhat disconnected from the lab material.  Well....... yeah.  The primary lecture parts include an overview/refresher on op-amp basics.  Another important lecture topic that is mostly review is bode plots.  A new topic that is covered is feedback signals, what they are, how they are used, and how they affect circuit behavior, including instabilities, frequency responses, and bandwidth restrictions.

Some of the labs include requirements to use parts that you have not used before, or you might have, but not quite in the necessary configurations.  For example, you should have used a 555 timer in your EE252 class, and you should have seen/built a D/A Converter in either EE252 and/or EE312 classes.  Just in case, however, here are some overviews of some of the sub-circuit components you may need:

  • 741, 1458, and 324 op-amps
  • integrator
  • differentiator
  • voltage summer, difference amplifier, voltage shifter
  • current mirror
  • 555 timer
  • CD4046B PLL chip




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    If you need to reach me, you can always email me at email (wenton@ieee.org)