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# Lab 2 - EE 271 Lab 2 Combinational Circuit Design...

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EE 271 Lab 2 Combinational Circuit Design University of Washington - Department of Electrical Engineering James K. Peckol Lab Objectives: The objectives of this lab are the following: To continue to introduce and use the various laboratory and design tools. To continue to learn about data sheets and real world properties of logic devices. To practice simplifying existing designs. To begin to learn to execute a logic design based upon a specified set of requirements. To begin to work with the Altera DE1 board and Quartus environment and tools. Reference Material Look on the class web page under documentation then find Using ispLever Starter Software.doc. The data sheets for the SN 74LS04 and for the GAL 16V8 gate array. Referenced sections from Appendices B and C in the Brown and Vranesic text, 2 nd ed. The DE 1 Board tutorials on the class web page under documentation. Cautions and Warnings Never connect the power supply to your lab partner or your TA. This makes him or her very crabby. Always make certain that your ICs have the writing side up before pressing them into the holes of your breadboard with your thumb. Never disconnect the power supply wires from your circuit and leave them lying on your bench. The current will drain out of the power supply and the supply will no longer be usable…. Unless, of course, you can manage to clean up the current and somehow put it back in. If you leave the current laying on your bench, it will no longer be current, but, passed. The same thing will happen if you happen to swallow a berry from a current bush. Thought, since the current bush is an annual plant, can it be used to solve the energy crisis? Background Instruments and Tools for Digital System Design and Analysis Let’s continue with our introduction to the various laboratory tools and this time take a look at the function generator. This tool provides a variety of different signals or waveforms that we can use as inputs to our systems.

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Among other properties of a generated signal, the function generator gives us the ability to control its amplitude, offset (with respect to ground), frequency (period), and pulse width. There are several characteristics that we will find to be common amongst most function generators: ground +v -v Figure 1 Their output is bipolar by default – the signal excursion is above and below ground as we see in figure 1. The instrument is designed to operate into a 50 Ω load. We must take these into account before we connect the generator to our circuit. Let’s see what that means. Laboratory Part 1 – Working with the Function Generator Configuring the Function Generator In this first lab project, we will learn to work with an oscilloscope. It’s one of our main tools for looking at the characteristics of signals in a circuit. We’ll find that it gives us a lot more information than a DVM.
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Lab 2 - EE 271 Lab 2 Combinational Circuit Design...

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