B.TechSemester 42021-22Analog CircuitsKEC402
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Analog Circuits (KEC402) - AKTU Question Paper 2021-22

B.Tech · Semester 4 · Free PDF Download

This is the official AKTU Analog Circuits Previous Year Question Paper for B.Tech Semester 4, 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 4
Session:2021-22
University:AKTU / UPTU

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Questions Asked in 2021-22

Analog Circuits (KEC402) — complete question paper

Section AAttempt all q u e s t i o n s i n b r i e f . 2x10 = 20
  • a
    Define stability factor for a biasing scheme. 1
  • b
    Draw the high frequency model of BJT. 1
  • c
    Define the efficienc y of power amplifiers. 2
  • d
    If open loop gain of an amplifier is 1000 and feedback factor of the system is .01, calculate the closed loop gain for negative feedback
  • e
    Define a stable and m onostable multivibrator. 3
  • f
    Explain the Barkhausen’s Criterion for oscillators. 3
  • g
    The output impedance of a current mirror should be infinite , justify the statement
  • h
    If differential mode gain of a differential amplifier is 1000 and common mode gain is 10, calculate the CMRR in decibel for it. (i) Explain the concept of virtual short in operational amplifi er. 5 (j) List the properties of an ideal operational amplifier. 5
Section BAttempt any three o f t h e f o l l o w i n g : 1 0 x 3 = 3 0
  • a
    Determine the values of 𝑹𝑫 and 𝑹𝑺 so that the following transistor operates at 𝑰𝑫 ൌ𝟎 . 𝟒 𝒎 𝑨 and 𝑽𝑫 ൌ𝟎 . 𝟓 𝑽. The NMOS transistor has 𝑽𝒕 ൌ
  • 𝟎
    𝟕 𝑽, 𝝁𝒏𝑪𝒐𝒙 ൌ 𝟏𝟎𝟎 𝑽𝟐 ,𝑳 ൌ 𝟏 𝝁 𝒎 and 𝑾ൌ𝟑 𝟐 𝝁 𝒎
  • b
    Discuss the advantages of neg ative feedback in detail with explanation. 2
  • c
    Derive the frequency of osc illation and condition of gain f or sustained oscillations for Wein Bridge oscillator
  • d
    Explain current steering and properties of a current mirror . Also derive the relation between output current and reference current in current mirror
  • e
    Derive the transfer functions and cut off frequency for the followings: (i) Low pass active filter, (ii) High pass active filter
Section CAttempt any one p a r t o f t h e f o l l o w i n g : 1 0 x 1 = 1 0
  • a
    Derive the expressions for input impedance, output impedanc e, open circuit voltage gain, overall voltage gai n and short circuit current ga in after completing the AC analysis of common emitter amplifier with emi tter resistance
  • b
    For the following circuit determine 𝒓𝒆, input impedance ሺ𝒁𝒊ሻ, output impedance ሺ𝒁𝟎ሻ, voltage gain ሺ𝑨𝒗ሻ, current gain ሺ𝑨𝒊ሻ. Neglect 𝒓𝟎 in all calculations
  • a
    Explain the various feedback topologies, with their circuit models and properties
  • b
    Discuss the working of class B power amplifiers with its efficiency and nonlinearity. Also discuss the remedy of nonlinear distortion associated with class B power amplifier
  • a
    Explain the operation of astable multivibrator with circuit and output waveforms. Also design an astable multivibrator which can generate a square wave of 10 KHz frequency
  • b
    Explain the working of a tank circuit. Also derive the freq uency of oscillation and condition of gain to get sustained oscillations for Colpitts oscillator
  • a
    Derive the mathematical expressions for common mode gain, d ifferential mode gain, input impedance and CMRR for differential amplifier
  • b
    Explain the transfer characteristics of differential amplif ier. Also derive the necessary mathematical expression required for it
  • a
    Design a circuit using a single operational amplifier for t he following mathematical operations: (𝑽𝟏 and 𝑽𝟐 are the available inputs)
  • b
    State the advantage of Super diode. Explain the operation o f precision full wave rectifier with proper circuit and output waveform

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

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