B.TechSemester 32021-22Analog ElectronicsKOE-037

Analog Electronics (KOE-037) - AKTU Question Paper 2021-22

B.Tech · Semester 3 · Free PDF Download

This is the official AKTU Analog Electronics Previous Year Question Paper for B.Tech Semester 3, academic session 2021-22. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 3

Session:2021-22

University:AKTU / UPTU

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Questions Asked in 2021-22

Analog Electronics (KOE-037) — extracted question text

Section AAttempt all q u e s t i o n s i n b r i e f . 2*10 = 20

a
Write name of any four diode circuits and draw low frequenc y hybrid-π model of BJT
b
What is objective of different biasing schemes for BJT and FET amplifier?
c
Define different paramete rs used in high frequency hybrid-π model. 2
d
What is effect of negative feedback on gain and bandwidth? 2
e
In an RC phase shift oscillator, R = 200 KΩ and C = 200pF. Find t h e frequency of BJT –based oscillator
f
Explain Barkhausen criterion. 3
g
Differentiate between CMRR and ICMR for a differential ampl ifier. 4
h
Determine the range of differential-mode operation of MOS d ifferential Pair of overdrive voltage (Vov) is 1V. (i) Draw the circuit of precision half wave rectifier and its i deal transfer characteristic. (j) What are the limitations of an ideal integrator? 5

Section BAttempt any three o f t h e f o l l o w i n g : 10*3 = 30

a
Draw the small signal AC equi valent circuit of a Common Drain FET amplifier. Derive the expression for voltage gain, input impeda nce and output impedance
b
Why class AB power amplifiers are preferred over Class B op erations? A transformer-coupled class A power amplifier supplies to an 80Ω load connected across the secondary of a step-down transformer havin g a turn-ratio 5:1. Determine the maximum power output for a zero s ignal collector of 120 mA
c
Draw the neat circuit diagram of RC phase shift oscillator and derive its frequency of oscillations
d
Discuss the basic topology of current mirror and its varian ts with V-I characteristics
e
Sketch the three-input inver ting summing circuit and derive a n expression for the output voltage. Find out the voltages V 2 and V 3 of the given network

Section CAttempt any one p a r t o f t h e f o l l o w i n g : 10*1 = 10

a
What is the significance of st ability factor in transistor operation? A voltage divider circuit has R1 = 39KΩ, R2 = 82 KΩ, RC = 3.3 KΩ, RE=1 KΩ and VCC =18V.The silicon transistor u sed has β=120. Find Q-point and stability factor
b
Why does gain of amplifier falls at low and high frequencie s? Specify different schemes of coupling in multistage amplifiers. Compare their merits and demerits
a
Find the midband gain and the upper 3-db frequency of the c ommon- emitter amplifier shown in given figure for the following case: VCC = VEE = 10V, I = 1mA, R B = 100 KΩ, RC = 8 KΩ, Rsig = 5 KΩ, RL= 5 KΩ, β0 = 100, VA = 100V, Cµ = 1pF, fT = 800 MHZ and rx = 50Ω
b
Explain the block diagram of a feedback amplifier. Draw the b l o c k diagram of voltage series feedback amplifier and find the effec t of feedback on input and output impedances
a
Draw the circuit of Wien-bridge oscillator and discuss its basic principle of operation. Also determine frequency of oscillation
b
With a neat circuit diagram, explain the operation of Colpi tts oscillator. Derive the expression for frequency of oscillation and the mini mum gain for sustained oscillations
a
Write short notes on any two of the following: (i)Minimum sustainable voltage(VON) (ii)Maximum usable load (iii) Differential gain and Common mode gain
b
Give the differential half-circuit of the differential ampl ifier shown in given figure. Assume that Q 1 and Q2 are perfectly matched. Neglecting ro, determine the differential voltage gain
a
Explain how a Schmitt Trigger circuit works with a neat dia gram. Design an Schmitt trigger with VUT = 2V, VLT = -1V. Assume േ Vsat =
b
How is order of filter decided? Design a wide band pass fil ter to meet the following specifications: f 1 = 5kHz, f 2 = 15kHz and Pass band gain=2

Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.

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