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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2010/
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 2010
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 forward and reverse characteristics for a typical silicon diode and explain their shape. [15 Marks] (b) Explain the term dynamic resistance when applied to a forward biased diode. [5 Marks]
Q. 2 (a) Define the decibel. [6 Marks] (b) Calculate the following power ratios as gains or losses in decibels; [8 Marks] (i) 1, (ii) 2, (iii) 2000 (iv) 0.5.
(c) Explain the term dBm when used as a standard reference level. [6 Marks]
Q.3 (a) Briefly explain what is meant by a complex waveform. [6 Marks] (b) Explain what is meant by the frequency spectrum of a complex waveform. [7 Marks] (c) Sketch the frequency spectrum of a square wave. [7 Marks]
Q.4 A sinusoidal voltage waveform is given by the equation v = 6 sin(1570.8 t ). Determine; (a) the peak value, [4 Marks] (b) the angular frequency, [4 Marks] (c) the cyclic frequency, [4 Marks] (d) the periodic time, [4 Marks] (e) the instantaneous voltage 2.5 ms into the cycle. [4 Marks]
