Topic: HND Electrical & Electronic Engineering?

Title: Digital Electronic Circuits

AIM OF THIS ASSIGNMENT

You will undertake a number of investigative activities designed to develop your understanding of combinational Logic.

ASSIGNMENT OBJECTIVES

In this assignment, for LO4, you will need to show that you can:

• Evaluate digital electronic device families.
• Design combinational digital electronic circuits.
• Design sequential digital electronic circuits.
• Test digital circuits by construction or by computer simulation.

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, Mithun, to produce a combinational logic circuit (Task 2). For Task 3 you have been requested to evaluate the operation of JK Flip Flops and present your findings and measurements to your line manager.

TASK 1: a) Using Manufacturer's datasheets complete the table below using Nominal values for the logic families.

b) Define the terms Fan-out and Noise Margin.

TASK 2: Design a circuit whose output goes HIGH when its inputs are: A is high and B is lowand either input C or input D is also HIGH.

Procedure:

a) Derive a Boolean that describes the performance of the required circuit.

b) Rearrange the expression in Sum-of-Products (SOP) form.

c) Using simulation software, Draw the circuit diagram and simulate its operation.

d) Produce a four-variable truth table and apply all combinations of input variables to the circuit and each time note the logical state.

e) Demonstrate the circuit operation to your tutor.

Opportunity for Distinction (Part A) (Both Part A and Part B must be completed for D2) Demonstrate, with photographic evidence, that you have simulated the circuit in Task 2 without any help from your peers and/or tutor.

Opportunity for Merit - Use Karnaugh Maps to check the SOP found in Part b, is equivalent to the original Boolean expression, found in Part a.

TASK3: a) Design a 4 bit asynchronous counter using JK flip flops to count between 2 and 9. Your design must include:

• Flow diagram
• Sequence table
• Karnaugh maps

b) Using a Logic Tutor or Multisim, construct the counter and demonstrate to your Tutor.

Opportunity for Merit

Produce a report containing the information found for TASKs 2 and 3. You will need to use a variety of word processing features and circuit diagrams created in Multisim. You will also need to use engineering language correctly.

Opportunity for Distinction (Part B)(Both Part A and Part B must be completed for D2) Demonstrate, with photographic evidence, that you have built the circuit in Task 3 without any help from your peers and/or tutor.

Description of activity undertaken (please be as specific as possible)

TASK 2: Design a circuit 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.

a) Demonstrate the circuit operation to your tutor.

TASK3: a) Using the Logic Tutors or Multisim construct the counter and demonstrate to your Tutor.

HND ASSIGNMENT EVIDENCE AND FEEDBACK