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Bachelor of Engineering (Honours) in Electronic Engineering Exam: Analogue Electronics, Exams of Digital & Analog Electronics

Aliah UniversityDigital & Analog Electronics

A past exam paper from the cork institute of technology for the bachelor of engineering (honours) in electronic engineering program, specifically for the analogue electronics module. The exam covers various topics in analogue electronics, including op-amps, differential amplifiers, amplifier circuits, oscillators, and timers. Five questions, each worth 20 marks, for a total of 100 marks. The exam was conducted in the summer of 2008.

Typology: Exams

2012/2013

Uploaded on 03/30/2013

lalitchohan
lalitchohan 🇮🇳

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Cork Institute of Technology
Bachelor of Engineering (Honours) in Electronic Engineering
– Stage 2
(EELXE_8_Y2)
Summer 2008
ANALOGUE ELECTRONICS
(Time: 3 Hours)
Answer five questions [each 20 marks]
Maximum available marks: 100
Examiners: Dr. M. Cranitch
Prof. G. Hurley
Dr. S. Foley
Q1. (a) With reference to an op-amp, explain the terms ‘virtual earth’, ‘output offset
voltage’ and ‘transition frequency’. In the case of the transition frequency,
quote the figure typical of the 741 op-amp. [7 marks]
(b) Define the term ‘slew rate’ in relation to an op-amp. Explain with the aid of a
circuit diagram and relevant waveforms how this parameter can be measured by
means of a laboratory experiment. [7 marks]
(c) Sketch time-related input and output waveforms for (i) an op-amp integrator,
and (ii) an op-amp differentiator, when a square wave is applied in each case [6 marks]
Q2. (a) Explain the terms ‘differential gain’, ‘common-mode gain’ and ‘common-mode
rejection ratio (CMRR)’ as applied to a differential amplifier. [6 marks]
(b) Draw the circuit diagram of an emitter-coupled differential amplifier with
emitter resistance, RE, and derive equations for (i) the differential gain, and
(ii) the common-mode gain. Hence show that the CMRR is given by
ρ
=RE
re
. [10 marks]
(c) Explain the operation of a ‘current mirror’, and indicate how it may be used in
place of RE in a differential amplifier to increase the value of the CMRR. [4 marks]
pf3

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Cork Institute of Technology

Bachelor of Engineering (Honours) in Electronic Engineering

– Stage 2

(EELXE_8_Y2)

Summer 2008

ANALOGUE ELECTRONICS

(Time: 3 Hours)

Answer five questions [each 20 marks]

Maximum available marks: 100

Examiners: Dr. M. Cranitch Prof. G. Hurley Dr. S. Foley

Q1. (a)^ With reference to an op-amp, explain the terms ‘virtual earth’, ‘output offset voltage’ and ‘transition frequency’. In the case of the transition frequency, quote the figure typical of the 741 op-amp. [7 marks]

(b) Define the term ‘slew rate’ in relation to an op-amp. Explain with the aid of a circuit diagram and relevant waveforms how this parameter can be measured by means of a laboratory experiment. [7 marks]

(c) Sketch time-related input and output waveforms for (i) an op-amp integrator, and (ii) an op-amp differentiator, when a square wave is applied in each case [6 marks]

Q2. (a) Explain the terms ‘differential gain’, ‘common-mode gain’ and ‘common-mode rejection ratio (CMRR)’ as applied to a differential amplifier. [6 marks]

(b) Draw the circuit diagram of an emitter-coupled differential amplifier with emitter resistance, RE , and derive equations for (i) the differential gain, and

(ii) the common-mode gain. Hence show that the CMRR is given by ρ = R^ E

re

. [10 marks]

(c) Explain the operation of a ‘current mirror’, and indicate how it may be used in place of RE in a differential amplifier to increase the value of the CMRR. [4 marks]

Q3. (a) Draw the circuit diagram of each of the following: (i) common collector amplifier, (ii) common drain amplifier, (iii) unity gain non-inverting op-amp circuit. List the three properties which these circuits have in common. [7 marks]

(b) Derive expressions for the voltage gain, input impedance and output impedance of the common collector amplifier in part (a)(i). [7 marks]

(c) For the circuit in the following diagram Vcc=12V, R 1 =27 k Ω , R 2 =4.7 k Ω , RE =1 k (^) Ω , RL=1 k (^) Ω , and (^) β=150. Determine the voltage gain, input and output impedances. [6 marks]

Q4. (a) Show, by deriving the relevant equation, that negative feedback in an amplifier circuit leads to a reduction in voltage gain. List the effects of negative feedback on the other parameters of an amplifier. [8 marks]

(b) Using the result for voltage gain obtained in part (a), derive equations for the voltage gain of (i) a non-inverting op-amp circuit, and (ii) a voltage follower. [6 marks]

(c) An amplifier has the following parameters without feedback: A=120, Ri =10kΩ, RO =1kΩ, fL=200Hz, fH =50kHz. If voltage-series negative feedback is applied, determine the amplifier characteristic when (i) β=1.5%, and (ii) β=7.5%. [6 marks]