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) — extracted question text

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. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.

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