If you should fail this module you will be permitted to be re-assessed on up to three
occasions. If you fail to attend or to submit work for re-assessment at the next opportunity
you will be deemed to have exhausted one of the opportunities.
Faculty of
Technology, Engineering and the Environment Re-assessment Brief
Undergraduate Programme
Academic Year 2010/2011
Module:
Analogue Electronics UG2
Assessment Title:
Technical Brief on Amplifier Output Stages and Tutorial questions exercise.
Assessment Identifier:
CWK1
School:
Computing, Telecommunications and Networks
Module Co-ordinator:
Gurvinder Dubb
Assessment Details and Deadlines:
See ECMS My Course on the intranet.
Brief Assessment Details
The assignment is broken down into two parts. Part A will be a technical paper researching into Amplifier Output Stages and part B tutorial questions in place of an analogue circuit design exercise.
IMPORTANT STATEMENT
Plagiarism: the presentation of the work of another (from whatever source: book, journal, internet etc) as if it were one’s own independent work. This can be anywhere on a continuum ranging from sloppy paraphrasing to verbatim transcription without crediting sources.
You are advised to refer to the Student Handbook on matters of cheating and plagiarism as they relate to coursework, group assignments, class tests and examinations. Both cheating and plagiarism are totally unacceptable and the University maintains a strict policy against them. It is YOUR responsibility to be aware of this policy and to act accordingly.
The University requires that the following statement is included in all module documents.
“You are reminded of the University Disciplinary Procedures which refer to cheating. Except where the assessment of an assignment is group-based, the final piece of work which is submitted must be your own work. Close similarity between assignments is likely to lead to an investigation for cheating. It is not advisable to show your completed work to your colleagues or to share and exchange disks.
You must also ensure that you acknowledge all sources you have used. Work which is discovered to be the result of collusion or plagiarism will be dealt with under the University‟s Disciplinary Procedures, and the penalty may involve the loss of academic credits.
If you have any doubts about the extent to which you are allowed to collaborate with your colleagues, or the conventions for acknowledging the source you have used, you should first of all consult module documentation and, if still unclear, your module tutor.”
You will be asked to confirm in writing when handing in any piece of assessed work that it is your own by completing the Coursework Submission & Record Form which should be printed from ECMS My-course on https://mytid.bcu.ac.uk/.
It is the STUDENT’S responsibility to accurately complete the form and comply with its rules and guidance as described in the student handbook for this academic year.
Learning Outcomes to be Assessed:
1. Demonstrate a technical understanding of analogue circuits, that includes all the electrical specifications, contents and applications.
2. Write a concise technical report detialing the technical specification and contents of analogue circuits and systems.
3. The report must demonstrate that the work produced is entirely your own orignal work and it has not been directly copied from the internet including Wikepdeia.
4. You are not allowed to directly copy any written text from the internet, however you may provide apporiately reference diagrams.
5. You are not allowed to take any material content from the WIKIPEDIA website.
Assessment Details:
Refer to attached sheets for further detials and a table of assessment criteria and associated grading criteria.
Assessment Criteria:
1. Demonstrate an understanding of theory.
2. Fully attempt the tutorial questions
3. Show full working out and step-by-step analysis of tutorial question.
4. Demonstrate neatness of attempted questions.
Undergraduate – BEng Modular Degree program
Analogue Electronics UG2
Referral Assignment
Assignment Details
The assignment is broken down into two parts. Part A will be a technical paper researching into Amplifier Output Stages and part B tutorial questions in place of an analogue circuit design exercise.
Part A – Amplifier Output Stages
You are required to produce a detailed Technical Brief on "Amplifier Output Stages". Your technical brief should contain descriptions of Class A, B, AB, C and D output stages and their uses, and a comparison of their relative advantages and disadvantages. The length should be no more than 2000 words.
You will find basic information in Horowitz and Hill, Art of Electronics and in standard electronics text books but you are recommended to read more widely than this. Provide a bibliography of the sources you have used. The technical brief or essay should be entirely your own work and any sources of information used must be correctly referenced (this also applies to any figures copied from elsewhere). References should be clearly indicated from their sources, i.e. internet or books.
NOTE: - Any direct copying from a webpage without it being properly referenced will be taken as act of „PLAGIARISM’ and a mark of 0% will be awarded for the technical brief.
Marking criteria
Use of English (spelling and grammar, clarity of writing) 5
Layout and Figures (clearly set out, appropriate use of references/bibliography, figures
correctly labelled etc…) 5
Circuit diagrams 4
Explanation of operation 8
Comparative discussion of the features and the uses of the different stages 8
Part B - TUTORIAL QUESTIONS ON FEEDBACK AND OSCILLATOR CIRCUITS
1. (a) Define a closed loop amplifier.
(b) A negative feedback amplifier is to have a voltage gain of 100. What feedback
fraction is required if the open loop gain is 430?
2. Describe, using circuit diagrams, how a feedback voltage may be derived from the output of an amplifier. Show how the way in which such feedback is derived affects the output resistance of the amplifier.
3. Using suitable diagrams show how negative feedback may be applied to the input terminals of an amplifier. Show the effect each of the methods you describe has on the input resistance of the amplifier.
4. A feedback amplifier is one in which the output signal is sampled and fed back to the input to form an error signal that drives the amplifier. The basic block diagrams of non-inverting and inverting feedback amplifiers are shown in Fig. 1.
(a) An amplifier has an open loop gain of 2 x 105 and an input resistance of 50 kΩ.
when negative feedback is applied in series with the input, the gain is reduced to
5 x 102. Find (i) the feedback fraction β, (ii) input resistance with feedback.
(b) What effect does negative feedback have on the bandwidth of an
amplifier ?
A
β
x
z
+
-
y
5. Describe an amplifier in which the whole of the output signal is fed back in opposition to the input signal. Deduce the gain of this amplifier with feedback and suggest an application for the amplifier.
(a) Describe an operational amplifier with negative feedback and derive an
expression for the voltage gain in terms of the feedback components.
(b) An amplifier with a voltage gain of -20,000 is used in a feedback circuit where
β = 0.02. Calculate the overall gain with feedback. If the gain of the amplifier
dropped to one-half of its inherent value because of a reduction in the supply
voltage, what would the overall circuit gain become?
6. Draw and describe an oscillator using a single transistor stage as an amplifier, with feedback applied by the way of an LC circuit. How could the feedback fraction be adjusted in an oscillator of this sort?
[Hint:- A single stage collector emitter amplifier having a resistive load replaced by an LC tuned circuit is basically referred to as a tuned-collector oscillator]
7. Draw and describe an the operation of a single stage transistor oscillator using C and R elements in its feedback network and discuss any advantages and disadvantages this circuit might have.
8. Describe the need when is zero phase shift in the amplifier section of the oscillator is necessary? Discuss how can a zero phase amplifier be achieved?
9. With the aid of a circuit diagram describe the operation of the Wien Bridge oscillator network. Draw a implementation of Wien Bridge oscillator circuit using both a transistor implementation and operational amplifier implementation. List the advantages of the Wien Bridge oscillator circuit.
10. A Wien Bridge oscillator network is designed for 20 kHz zero phase shift.
If R1 = R2 = 1KΩ, find C1 and C2.
Table of Assessment Criteria and Associated Grading Criteria for Part B
Assessment
Criteria
1. Demonstrate an understanding of theory
2. attempts made on the tutorial questions
3. Show full working out and step-by-step analysis of tutorial question
4. Demonstrate neatness of attempted questions
Weighting:
0.2
0.2
0.5
0.1
Grading
Criteria
0 – 29%
Little evidence given in applying an understanding of the principles and theory relating to transistor theory
Little evidence, or attempt made on the questions
No attempt made in showing any step by step working out
Little or no attempt effort made to produce neat and clear work
30 – 39%
Some evidence given in applying an understanding of the principles and theory relating to transistor theory
Indicates ability but significant incompleteness in attempting the questions
some attempt made in showing any step by step working out
Some attempt effort made to produce neat and clear work
40 – 49%
Sufficient evidence given in applying an understanding of the principles and theory relating to transistor theory
Demonstration of ability but there may be a basic attempt in the questions and some errors
Reasonable attempt made in showing any step by step working out
Reasonable attempt effort made to produce neat and clear work
50 – 59%
Appropriate evidence given in applying an understanding of the principles and theory relating to transistor theory
Generally satisfactory, but there may be some errors/ incompleteness in the questions
Good attempt made in showing any step by step working out
Good attempt effort made to produce neat and clear work
60 – 69%
留学生论文代写Significant evidence given in applying an understanding of the principles and theory relating to transistor theory
Generally complete and without errors, with supporting explanatory text in answering the questions
Very good attempt made in showing any step by step working out
Very good attempt effort made to produce neat and clear work
70+%
Demonstrating an excellent understanding of the principles and theory relating to transistor theory
Correct and well laid out with clear integrated explanatory text in answering the questions
Excellent attempt made in showing any step by step working out
Excellent attempt effort made to produce neat and clear work