DIGITAL & ANALOGUE DEVICES &CIRCUITS
Before you start please read the following instructions carefully.
1. This assignment forms part of the formal assessment for this module. If you fail to reach the required standard for the assignment then you will be allowed to resubmit but a resubmission will only be eligible for a Pass grade, not a Merit or Distinction.
You should therefore not submit the assignment until you are reasonably sure that you have completed it successfully. Seek your tutor's advice if unsure.
2. Ensure that you indicate the number of the question you are answering.
3. Make a copy of your answers before submitting the assignment.
4. Complete all details on the front page of this TMA and return it with the completed assignment to your support centre via Blackboard.
5. Your tutor's comments on the assignment will be posted on Blackboard as a separate feedback sheet. Your assignment will not be returned to you.
6. You will need access to a computer and the Simetrix software as used in the module to complete all of the questions in this assignment.
1. Demonstrate an understanding of a variety of electronic circuits including power supplies operational amplifier circuits and digital logic circuits Cognitive and Intellectual Skills
2. Choose appropriate circuit components for the design of electronic circuits. Practical and Professional Skills
3. Build, simulate and test simple electronic circuits
4. Demonstrate the application of numerical skills to the solution of problems relating to digital and analogue devices and circuits
1. In the logic circuit shown in FIGURE 1, switches A and C are closed and B and D open.
Give the required state of the push button switches a, b, c and d in order for the circuit to give a logic '1' output.
2. Complete the table below for the circuit of FIGURE 2 and hence determine the type of logic gate formed.
|
B
|
A
|
Q1
|
Q2
|
Q3
|
Q4
|
Q5
|
Q6
|
F
|
|
0
|
0
|
ON
|
ON
|
OFF
|
OFF
|
|
|
|
|
0
|
1
|
OFF
|
|
|
|
|
|
|
|
1
|
0
|
|
|
|
|
|
|
|
|
1
|
1
|
|
|
|
|
|
|
|
3. Write down the minimal Boolean expression for each of the Karnaugh maps give below.
a.
| DC\BA |
00 |
01 |
11 |
10 |
| 00 |
1 |
1 |
1 |
1 |
| 01 |
1 |
0 |
0 |
0 |
| 11 |
1 |
0 |
0 |
0 |
| 10 |
0 |
0 |
0 |
0 |
b.
| DC\BA |
00 |
01 |
11 |
10 |
| 00 |
1 |
0
|
0
|
1 |
| 01 |
0
|
1
|
0 |
0 |
| 11 |
0
|
0 |
0 |
0 |
| 10 |
1
|
0 |
0 |
1
|
c.
| DC\BA |
00 |
01 |
11 |
10 |
| 00 |
1 |
1
|
1
|
1 |
| 01 |
1
|
0
|
0 |
1
|
| 11 |
1
|
1
|
1
|
1
|
| 10 |
1
|
1
|
1
|
1
|
d.
| DC\BA |
00 |
01 |
11 |
10 |
| 00 |
0
|
0
|
1
|
1 |
| 01 |
0
|
0
|
1
|
0 |
| 11 |
0
|
1
|
0 |
0 |
| 10 |
1
|
1
|
0 |
0
|
4. Design a modulo-6*, D-type, asynchronous down-counter in which gated outputs reset the bistables after the appropriate count is achieved.
Test your design on PSpice.
When submitting your answer, show your design workings and give screen shots of your circuit and appropriate waveforms.
[A PSpice model of a three-stage, D-type, asynchronous down-counter is given on Blackboard for you to modify.]