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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2012/
Module Title: ANALOGUE ELECTRONICS 3
Module Code: ELTR
School: Mechanical, Electrical, & Process Engineering
Programme Titles: Bachelor of Engineering in Electronic Engineering - Year 2 Bachelor of Engineering in Electronic Systems Engineering - Year 2
Programme Codes: EELXE_7_Y EELES_8_Y
External Examiners: Mr T. O’Brien, Mr I. Kennedy Internal Examiner: Mr M. O’Gorman
Instructions: Answer Question 1 and two other questions
Duration: 2 Hours
Sitting: Winter 2012
Requirements for this examination: None
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) Draw the circuit diagram of a 555 integrated circuit timer, configured as an astable multivibrator. [10 Marks]
(b) Show that when negative feedback is applied to an amplifier, the resulting gain is given by AB
G A
where A is the amplifier gain without feedback, and B is the gain of the feedback path. [10 Marks]
(c) Outline the characteristics of an ideal operational amplifier. [6 Marks] Sketch the circuit diagram of an inverting amplifier with a gain of 50. [4 Marks]
(d) Define mark-space ratio and duty cycle as applied to a rectangular waveform. [6 Marks] Indicate the mark-space ratio for a waveform with a duty cycle of 60%. [4 Marks]
Q.2 (a) Outline what is meant by class A and class B amplifier operation. [14 Marks]
(b) In the case of a class B push-pull amplifier, explain crossover distortion. [10 Marks]
(c) Explain, with the aid of a circuit diagram, how this distortion can be eliminated. [6 Marks]
Q.3 (a) Draw the circuit diagram, and derive an expression for the output voltage, for each of the following op-amp circuits;
(i) an integrator amplifier, [10 Marks] (ii) a differentiator amplifier. [10 Marks] (b) Sketch time-related waveforms of the input and output voltages for each of the circuits in part (a) when the input is a square wave. [10 Marks]
