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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2009/
Module Title: ANALOGUE ELECTRONICS 3
Module Code: ELTR
School: ELECTRICAL & ELECTRONIC 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 Examiner(s): Dr. A. Donnellan Dr. P. O’Sullivan
Internal Examiner: Mr M. O’Gorman
Instructions: Answer Question 1 and two other questions
Duration: 2 Hours
Sitting: Winter 2009
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) Sketch the circuit diagram of a non-inverting amplifier with a gain of 40. [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) State the conditions necessary for a circuit to oscillate. What are these called? [10 Marks]
(d) Define mark-space ratio and duty cycle as applied to a rectangular waveform. Indicate the mark-space ratio for a waveform with a duty cycle of 60%. [10 Marks]
Q.2 (a) Draw the circuit diagram of a 555 integrated circuit timer, configured as an astable multivibrator. [10 Marks] (b) State the formulae for (i) frequency of operation, (ii) duty cycle. [10 Marks] (c) Calculate suitable component values for a frequency of 1 kHz. [10 Marks]
Q.3 (a) Outline the characteristics of an ideal operational amplifier. [6 Marks] (b) Draw the circuit diagram,and derive the overall gain of the circuit for each of the following; (i) an inverting amplifier, [12 Marks] (ii) an inverting summing amplifier (adder). [12 Marks]
