Download Analog Electronics 3 Exam at Cork Institute of Technology, Autumn 2011 and more Exams Digital & Analog Electronics in PDF only on Docsity!
CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2010/
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
Mr. I. Kennedy
Internal Examiner: Mr M. O’Gorman
Instructions: Answer Question 1 and two other questions
Duration: 2 Hours
Sitting: Autumn 2011
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) Briefly outline what is meant by class A and class B amplifier operation. [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) Draw the circuit diagram of a differentiator amplifier. [5 Marks]
Sketch time-related waveforms of the input and output voltages when the input
is a square wave. [5 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 80%. [4 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. [8 Marks]
(c) Calculate the frequency and duty cycle of the circuit in (a) for component
values of; R 1 = 8kR 2 = 1kand Cext = 0.1F. [12 Marks]
Q.3 (a) Òutline the characteristics of an ideal operational amplifier. [10 Marks]
(b) Draw the circuit diagram and derive an equation for the output voltage of a
2-input inverting summing amplifier (adder). [20 Marks]
