Report Structure and Content 1. Introduction 2. Methods, results and analysis for Part 21: Investigating the unknown circuit. - brief explanation of your testing procedure - a truth table for the circuit brief explanation of difficulties (if any) analysis using De Morgan's Theorem to deduce Boolean expressions for the outputs X and Y of the unknown circuit in terms of the inputs A, B and C. 3. Methods, results and analysis for Part 3.2 - circuit diagram and brief explanation of your measurement procedure - images of the observed signals - brief explanation of the signal waveform, in terms of propagation delay of the input waveform through the logic gates. 4. Summary/n ELEC143-Experiment L Department of Electrical Engineering and Electronics ELEC143 Experiment L: Logic Circuits Overview: The experiment is a component of ELEC143 Digital & Integrated Electronics Design. The aim of Experiment L is to introduce you to practical aspects of digital circuits. The first objective of this experiment is to introduce you to some practical aspects of logic circuits. You are first introduced to the equipment that you need for testing logic circuits, and then you are asked to test various types of logic circuits and to understand the function of each logic circuit. - The second objective is to give you some experience of setting up an integrated circuit (IC) chip, in this case a chip that contains logic circuits. An IC is a component that contains a particular circuit already made, which you as a user can access with one or more inputs, and one or more outputs. One feature of ICs is that they contain a large number of components inside them – perhaps a complicated combination of resistors, capacitors, transistors, and diodes. You, however, don't have to wire those components yourself – all that is done for you inside the IC. You just have to connect the appropriate inputs, and the IC will generate the appropriate outputs. The activities in the lab session include: • Testing circuits based on the basic Boolean gates AND, OR and NOT • Identifying an unknown logic circuit from knowledge of its truth table • Testing a ring oscillator circuit based on NOT gates This integrated circuit contains multiple logic gates for use in a practical digital circuit. The writing on the device helps you identify the component. The photo shows a 74HCT14 integrated circuit. This number is on the second line: the rest of the ID number contains relevant information, but the main ID is the 74***14 section. 4CADFPKE4 CD74HCT14E ELEC143-Experiment L Assessment: The assessment is in two parts. Both documents should be uploaded to the ELEC143 website. Laboratory notebook (Pass/Fail) After your laboratory session, you should scan the relevant pages of your lab book, including any graphs, put them in a single document, and submit online in Word or pdf format by 11:59 pm on the day of your lab session. Your submission will not be given a mark, but you must submit your lab notes as evidence that you have done the work. Laboratory Report (100%) You are required to complete a formal report for this experiment. You should write the report using a word-processor file and upload the file to Canvas, with a deadline that depends on the day of your lab session. The requirements of the report are given on the ELEC143 website. YOU MUST SUBMIT YOUR LAB NOTES TO PASS THE EXPERIMENT. YOUR REPORT WILL NOT BE MARKED UNLESS YOUR LAB NOTES WERE SUBMITTED ON THE DAY OF YOUR LAB SESSION. Experiment specifications: Module(s) ELEC143 Component Experiment L: Logic circuits Coursework weight 10% of your ELEC143 grade Level 4 Lab location EEE building, 3rd floor electronics laboratory Work Individual Suggested study time Assessment method Deadline for submission Submission link 6 hours laboratory + 6 hours after-laboratory work Lab notes (pass/fail) + Report (100%) Lab book: day of your lab session, 23:59 pm Lab report: Wednesday of the week after your lab session, 23:59 pm ELEC143 Canvas site ELEC143-Experiment L Part 1: Introduction and background 1.1 The analog digital training system For this experiment, you will use a test device called an analog-digital training system. A photo of the device is shown in Figure 1. You should see this on the bench in front of you. The digital-analog training device is a single piece of equipment that has includes many functions needed to test digital and analog circuits. On the bench, you already have a DC power supply and a signal generator, and you could test digital circuits using these instruments in the same way that you build and test analog circuits in other experiments. The training device on your bench is a single device that allows you to test digital circuits in a particularly convenient way. You can view a video brief introduction to the device at this link given in the Experiment L announcement on the ELEC143 Canvas site. The rest of Section 1 provides a detailed explanation of how the device works, and you should read it. The video explanation will serve as a good introduction. DC voltage supply E Universal Counter Function Generator 77L ENTR ETS-7000A KH Digital-Analog PRODUCTS Training System wwwww LED indicator lamps & Bits LED Displays BODE WODY Ov arte Digital Display Adapter Speaker 8 Bits Data Switches Pulse Switch AC voltage supply On/Off (1/0) switches Figure 1.1: The analog-digital training device, showing the location of the different parts of the device that allow you to both analog and digital inputs and outputs. 3 ELEC143-Experiment L The next few paragraphs explain the various parts of the training system. You should view your own training device while reading this text. The different components of the device include: A circuit testing board: the device has a large test board, with a lot of space to set up circuits. The principle of the board is the same as the one you have used already in other experiments. The sets of holes are connected in different ways to allow you to build up and test your circuits. The arrangement is shown in Figure 1.2. о Look at the test board on your own training device and compare it with the arrangement shown in Figure 1.2. Make sure that you can identify the various connections. If you are not sure, ask a demonstrator to explain it to you. red and blue lines showing that the holes in 11 the row are connected ABCDE V3 V1 GHIJKL rows of 6 holes connected together GHIJK A B C D E F GHIJK GHIJKL rows of 6 holes connected together 4 5 6 7 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 10 11 12 13 14 1 25 26 27 28 29 30 3 24 25 26 27 28 29 30 Figure 1.2: Large test board with many multiple areas for setting up components. . A DC voltage supply: the device has a DC voltage supply built into it - see Figure 1.3(a). This is a low power simplified version of the DC voltage supply that you have use on the bench for other experiments. An AC voltage supply: the device also has a simple AC voltage supply - see Figure 1.3(b). This generates some simple waveforms and performs some of the function of the signal generator that you have already used. 4 (a) ELEC143-Experiment L knobs to set the voltage for the variable voltage sources OFF connections for 5 V, - 5 V and ground ON +5V GND -5V Min. Max. Min. Max. 0-115V DC Power 0--15V connections for left and right variable voltage supplies. One wire should connect to the appropriate red connection. The other cable should connect to the black ground connection. (b) Min. TL F Input S KHz SEL. GND Universal Counter EXT INT CNTR Min. Max. Amplitude Frequency TTL Mode O GNDO Max. Output O numerical display that shows the frequency trigger setting knob to adjust the numerical value of frequency of the output waveform Range Function Function Generator knob to adjust the magnitude of the frequency of the output waveform connections for positive and ground outputs for the function generator and right variable voltage supplies Figure 1.3: (a) DC voltage supply and (b) signal generator in the training device Switches and indicator lamps: the device has a set of switches and a set of indicator LEDs, which provide a convenient way to set up and test logic circuits. These are shown in Figure 1.4. The switches provide either 5 V or 0 V, corresponding to the two logic inputs of 1/0, or On/Off. The indicator lamps light up when a positive voltage of 5 V is provided. These lamps can be used to indicate whether the output of a digital circuit is 1 or 0 (or On or Off). Of course, you could set up your own 5 V and 0 V sources, using the bench power supply. You could also include your own LEDs in a circuit. The training device, though, 5