Download Digital Signals - Analogue Electronics - Exam and more Exams Digital & Analog Electronics in PDF only on Docsity!
CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2007/
Module Title: ANALOGUE ELECTRONICS-
Module Code: ELTR
School: ELECTRICAL & ELECTRONIC ENGINEERING
Programme Title: Bachelor of Engineering – Applied Electronics Design, Year 1 Bachelor of Engineering – Communications Systems, Year 1 Bachelor of Engineering – Electronic Automation & Robotics, Year 1
Programme Code: CR_EELXE_7_Y
External Examiner(s): Mr. D. Denieffe Dr. P. O’Sullivan Internal Examiner: Mr M. O’Gorman
Instructions: Answer 10 of the 12 Questions. All Questions Carry Equal Marks.
Duration: 2 Hours
Sitting: Winter 2007
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) Briefly explain the differences between continuous and discrete information sources. [6 Marks] (b) Describe how analogue and digital signals might be used to represent this information. [4 Marks]
Q. 2 Briefly explain what is meant by a complex waveform. [10 Marks]
Q. 3 With reference to an amplifier’s frequency response plot, explain what is meant by the
terms half-power points and bandwidth. [10 Marks]
Q. 4 Explain the term dynamic resistance when applied to a forward biased diode. [10 Marks]
Q. 5 Draw a sketch of the electromagnetic spectrum showing the main regions into which
electromagnetic waves of different frequencies are allocated. [10 Marks]
Q. 6 (a) Define the decibel. [2 Marks]
(b) Express the following power ratios as gains or losses in decibels; [8 Marks] (i) 1, (ii) 2, (iii) 200 (iv) 0.5.
Q. 7 The input signal voltage level to an amplifier is +24dB relative to 1μV, and the amplifier has a decibel voltage gain of 30dB. If the input and ouput resistances are equal, calculate the input and output voltages. [10 Marks]
