Programme: HND Electronic Engineering
Unit Number and Name: Unit 117 Digital and Analogue Devices and Circuits F/602/2237
Level: QCF Level 5
Assignment Title - Digital Electronic Circuits
AIM OF THIS ASSIGNMENT
You will undertake a number of investigative and practical activities designed to develop your understanding of digital electronic circuits.
ASSIGNMENT OBJECTIVES:
In this assignment, you will need to show that you can design, build and test digital electronic circuits.
1. Compare different digital electronic device families.
2. Design and construct combinational and sequential digital electronic circuits using logic devices.
3. Test digital electronic circuits.
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Merit Descriptors In order to achieve a Merit the learner must:
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Indicative Characteristics The learners evidence shows:
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Contextualised Evidence. To achieve the grade you will need to.
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M1 - Identify and apply strategies to find appropriate solutions.
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Complex problems with more than one variable have been explored.
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Design a sequential circuit using external inputs.
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M2 - Select/design and apply appropriate methods/techniques.
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A range of methods and techniques have been applied.
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Design a sequential logic circuit using an alternative model.
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Distinction Descriptors In order to achieve a Distinction the learner must:
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Indicative Characteristics The learners evidence shows:
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Contextualised Evidence. To achieve the grade you will need to.
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D2 - Take responsibility for managing and organizing activities.
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Autonomy/independence had been demonstrated.
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Demonstrate that you have completed a complete task on your own, without any support.
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D3 - Demonstrate convergent/lateral/creative thinking
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Problems have been solved
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Add additional inputs and solve a higher level problem
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TASK INTRODUCTION -
You have completed your engineering apprenticeship and have a position in the design department of your company. You have been asked by your line manager to analyse logic families and to produce combinational and sequential logic circuits.
TASK 1:
a) Using Manufacturer's datasheets complete a table using Nominal values for the following logic families: LS TTL, ALS TTL, CMOS, HCMOS, (Include excerpts from datasheet in appendix)
b) Briefly explain the different types of scales of integration: SSI, MSI, LSI, VLSI. (one sentence each)
c) Briefly explain the different types of programmable devices: PROM, PAL, PLA. (one-two sentances)
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TASK 2:
You are to design a 3-bit counter with outputs Q0, Q1, Q2, where Q0 is the least significant bit.
The sequence 0, 2, 3, 5, 7, 6, 4, 0, 2 . . . is generated:
010 (2)
011 (3)
101 (5)
111 (7)
110 (6)
100 (4)
000 (0)
Part 1 - Design the circuit. (Use any type of flip-flops e.g., JK T or D, and any gates)
Include truth tables and Karnaugh maps in your answer.
Opportunity for merit -
Design the circuit using only another type of flip-flop and NAND gates logic.
Opportunity for merit -
Re-design the circuit with an UP/DOWN counter input, so that the sequence can be reversed. The counter has a single input D, when D is low the counter counts up the sequence, when D is high the counter counts down the sequence.
Use the Moore model (This requires outputs to be decoded)
Your answer should include truth tables, Karnaugh maps.
Part 2 - Using circuit simulation software, draw a circuit diagram from Task 2, Part 1 and simulate its operation.
Demonstrate the circuit operation to your tutor.
Opportunity for Distinction -
Re-design the circuit with an UP/DOWN counter input, so that the sequence can be reversed. The counter has a single input D, when D is low the counter counts up the sequence, when D is high the counter counts down the sequence.
Use the Mealy model.
Your answer should include truth tables, Karnaugh maps and be made using only JK type flips flops. Demonstrate to your tutor that the circuit works using simulation software.
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TASK 3:
Design a circuit using only NAND gates, whose output goes HIGH when its inputs are: A is high and B is low and either input C or input D is also HIGH and make a sketch. Derive a Boolean equation that describes the performance of the required circuit.
Part 2 - a) Using a 'Logic Tutor' design and construct the circuit using the output connected to a LED or Logic-probe, and produce a four-variable truth table and apply all combinations of input variables to the circuit and each time note the logical state of the output.
b) Demonstrate and test the circuit operation for your tutor.
Opportunity for distinction -
You need to demonstrate that you have completed the assignment without support from your lecturer or peers.