Posted: March 24th, 2015

Design of a Motor Speed Sampling, Amplification, Filtering and Display Circuit/ Faculty of Technology and Environment

Coursework Title:
Design of a Motor Speed Sampling, Amplification, Filtering and Display Circuit

Introduction

The objective is to design the circuits used for motor speed sampling, amplification, filtering and display. In this assignment, students are required to
• practice analogue and digital circuit design and optimization
• build a current amplifier circuit
• design a low-pass filter
• build a 7-segment display decoder
• display the output on the seven-segment display
• simulate the design in Proteus
Learning Outcome to be assessed

LO1 Analyse electronics by using diode and transistor characteristics for simple amplifier design.
LO2 Describe circuits design for analogue signal processing.
LO3 Examine electronics through analysing and designing basic combinational digital circuits.
LO4 Identify sequential digital circuits and applications.
Detail of the task

Analogue:
A remote motor speed sensor provides a DC current signal in the range of -2.5 to 2.5 mA. Design a circuit to convert this signal into a DC voltage signal in the range from 2 to 3 V. After the conversion, a low pass filter is used to suppress any noise AC signals with frequency higher than 100 Hz.

Digital:
A 8-bit digital-to-analogue converter should be used to convert the output of the above analogue circuit into an 8-bit digital signal. The 8-bit signal should go through the 4-7 decoder so that the value of the 8-bit digital signal are displayed in two-bit hex decimal accordingly on two seven segment display devices to indicate the safe running speed of the motor in 0-255 scales.

Part 1: Design a current sampling, amplification and filtering circuit.

Use an AC current source with a very low frequency of 0.01 Hz to emulate the slowly changed DC current output signal from the remote motor speed sensor. Design the current sampling/amplification circuit using appropriate circuits so that you can achieve the required output voltage. Demonstrate the gain, Bandwidth, Rin of your op-amp circuits by both calculation and simulation.

Design the low-pass filter. Demonstrate the bandwidth of the filter by both calculation and simulation.

Combine the op-amp and the filter. Demonstrate the gain, Bandwidth, phase shift, Rin of your combined circuit by both calculation and simulation.

Extenuating Circumstances
If something serious happens that means that you will not be able to complete this assignment, you need to contact the module leader as soon as possible. There are a number of things that can be done to help, such as extensions, waivers and alternative assessments, but we can only arrange this if you tell us. To ensure that the system is not abused, you will need to provide some evidence of the problem.
More guidance is available at http://www.ljmu.ac.uk/student-administration/126427.htm
Any coursework submitted late without the prior agreement of the module leader will receive 0 marks.
Academic Misconduct
The University defines Academic Misconduct as ‘any case of deliberate, premeditated cheating, collusion, plagiarism or falsification of information, in an attempt to deceive and gain an unfair advantage in assessment’. This includes attempting to gain marks as part of a team without making a contribution. The Faculty takes Academic Misconduct very seriously and any suspected cases will be investigated through the University’s standard policy (Academic Misconduct). If you are found guilty, you may be expelled from the University with no award.
It is your responsibility to ensure that you understand what constitutes Academic Misconduct and to ensure that you do not break the rules. If you are unclear about what is required, please ask.

For more information you are directed to following the University web pages:

• Information regarding academic misconduct: http://www.ljmu.ac.uk/corporate/SPR/89510.htm
• Information on study skills: http://www.ljmu.ac.uk/studysupport/
• Information regarding referencing: http://www.ljmu.ac.uk/studysupport/69049.htm
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