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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2011/
Module Title: ANALOGUE ELECTRONICS 1
Module Code: ELTR
School: ELECTRICAL & ELECTRONIC ENGINEERING
Programme Titles: Bachelor of Engineering in Electronic Engineering, Year 1 Bachelor of Engineering in Electronic Systems Engineering, Year 1
Programme Codes: EELXE_7_Y EELES_8_Y
External Examiner(s): Dr A. Donnellan Mr I. Kennedy Internal Examiner: Mr M. O’Gorman
Instructions: Answer 5 of the 7 Questions. All Questions Carry Equal Marks.
Duration: 2 Hours
Sitting: Winter 2011
Requirements for this examination: N/A
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you are attempting the correct examination paper. If in doubt please contact an Invigilator.
Q.1 (a) Sketch a typical amplifier frequency response plot. [5 Marks] (b) Explain what is meant by the terms half-power points and bandwidth. [15 Marks]
Q.2 (a) Briefly explain the differences between continuous and discrete information sources. [10 Marks] (b) Describe how analogue and digital signals might be used to represent this information. [10 Marks]
Q.3 (a) Define the decibel. [6 Marks]
(b) Calculate the following power ratios as gains or losses in decibels; (i) 1, (ii) 2000 (iii) 0.5 [6 Marks] (c) The first stage of a 2-stage amplifier has a voltage gain of 40, and the second stage has a voltage gain of 20. Calculate (i) the decibel voltage gain of each stage, (ii) the overall voltage gain of the amplifier in decibels. [8 Marks]
Q.4 (a) Sketch circuit diagrams of both a half-wave rectifier and a full-wave bridge rectifier. [12 Marks] (b) Briefly describe the operation of the half-wave bridge rectifier. [8 Marks]
Q.5 Show how capacitor smoothing may be introduced to a half-wave rectifier, and illustrate its effect with the help of waveform diagrams. [20 Marks]
