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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn 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: Autumn 2010
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 an inverting amplifier with a gain of -25. [10 Marks]
(b) Show that when negative feedback is applied to an amplifier, the resulting gain
is given by AB
A
G
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) Outline the characteristics of an ideal operational amplifier. [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 the frequency of the circuit in (a) for component values of;
R 1 = 2.2kR 2 = 2.2kand Cext = 0.047F. [10 Marks]
Q.3 (a) Draw the circuit diagram,and derive the overall gain of the circuit for each of
the following;
(i) a non-inverting amplifier [12 Marks]
(ii) an inverting summing amplifier (adder). [12 Marks]
(b) Show how the non-inverting amplifier of (a)(i) can be converted into a unity
gain buffer amplifier. [6 Marks]
