BISF 1208 – SEMICONDUCTORS AND ELECTRONIC DEVICES KCA Past Paper

UNIVERSITY EXAMINATIONS: 2019/2020
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN
INFORMATION SECURITY & FORENSCIS
BISF 1208: SEMICONDUCTORS AND ELECTRONIC DEVICES
FULL TIME/ PART TIME
DATE: MAY, 2020 TIME: 6 HOURS
INSTRUCTIONS: Answer ALL Questions

SECTION B: 20 MARKS
a) Design a simple single transistor amplifier for a microphone (A gain of less than 200 is acceptable).
Draw the circuit. Choose the transistor, resistors R1 to R5, capacitor C1. Mention the use of each
component in the amplifier. Simulation with every circuit app (Android) will be an added
advantage. Include any screen-shots of the simulation.
(20 Marks)
SECTION C: 20 MARKS
Describe the construction and operation of the following optoelectronic devices. For each give two
advantages and disadvantages.
(i) photoconductive cells
(ii) pn junction photodiodes
(iii) photoisolators
(iv) photovoltaic cells
(20 Marks)

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