ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Google
   
 
Categories >> Engineering >> Electronics Communications
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions (3129)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3300)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13439)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2385)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (420)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (80)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (165)
 Instrumentation interview questions  Instrumentation Interview Questions (2401)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (107)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (45)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (80)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1203)
Question
what is Barkhausen Criterion?
 Question Submitted By :: Electronics-Communications
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
1./AB/=1,i.e. the magnitude of loop gain must be unity
2.the total prase shift around the closed loop is zero or
360 degrees.
 
Is This Answer Correct ?    52 Yes 4 No
Sindhu
 
Answer
# 2
This Criterian is necessary to make a successfull
oscillator and the conditions are
1. loop gain must be unity
2. total phase shift should be zero or 360 degrees
 
Is This Answer Correct ?    36 Yes 8 No
Louis
 
 
 
Answer
# 3
The history of the Barkhausen Stability Criterion is an
unfortunate one. In 1921, during his study of feedback
oscillators, Barkhausen developed a ``formula for self-
excitation''

KF(jw)=1

where K is an amplifier gain factor and F(jw)is the
frequency dependence of the feedback loop. This equation
was originally intended for the determination of the
oscillation frequency for use in radio transmitters.
However, before conditionally-stable nonlinear systems were
understood, it was widely believed that only a single value
of K separated stable and unstable regions of behavior.
Thus, Barkhausen's Criterion was incorrectly used as a
stability criterion, especially in the German literature
 
Is This Answer Correct ?    34 Yes 18 No
Anindita
 
Answer
# 4
1]The product of gain & feedback factor must be unity.
2]The total phase shift around the main loop should be 0
deg. or multiple of 360 deg.
 
Is This Answer Correct ?    18 Yes 6 No
Santosh
 
Answer
# 5
the magnitude of AB is greater than equal to 1
which angle is 0 to 360 degree
 
Is This Answer Correct ?    23 Yes 12 No
Omjee
 
Answer
# 6
Sum of all the phase angles in a positive feedback circuit
should be multiples of 360 degrees.
 
Is This Answer Correct ?    23 Yes 14 No
Saida Reddy.a
 
Answer
# 7
magnitude of AB is greater than or equal to 1.a is the open
loop gain,b is the feedback factor and ab is the closed loop
gain.also,the totl phase shift around the closed loop is 0
or 360 degrees.
 
Is This Answer Correct ?    17 Yes 8 No
Roz
 
Answer
# 8
A criterion used to determine the stability of an oscillator
circuit which states that, if the circuit is seen as a loop
consisting of an amplifier with gain A and a linear circuit
whose gain β(jω) depends on frequency ω, then the loop will
oscillate with a perfect sine wave at some frequency ω0 if
at that frequency Aβ(jω0) = 1 exactly, that is, if the
magnitude of Aβ(jω0) is exactly 1 and its phase is 0° or 360°.
 
Is This Answer Correct ?    10 Yes 4 No
Mani
 
Answer
# 9
Barkhausen's Criterion may be found in his book "Lehrbuch
der Elektronen-Röhren", 3. Band:, “Rückkopplung”, Verlag S.
Hirzel, 1935, Achte Auflage, pp. 4–5, 1960. He pointed out
that an oscillator may be described as an inverting
amplifier (a vacuum tube) with a linear frequency
determining feedback circuit. The non-linear amplifier is a
two-port with a static gain-factor equal to the ratio
between the signals at the ports. The linear feedback
circuit is a two-port with a feed-back-factor equal to the
ratio between the port signals. It is obvious that the
product of the two factors becomes equal to one. The product
is called the Barkhausen Criterion or the "Allgemeine
Selbsterregungsformel" in German language.
 
Is This Answer Correct ?    2 Yes 1 No
Erik Lindberg
 
Answer
# 10
Closed Loop GAIN in presence of POSITIVE FEEDBACK can be
calculate by fomula = Av` = Av/(1-β.Av)

Where,
Av` = closed loop gain.
Av = open loop gain.
β = is feedback ratio

So, according to Barkhausan Criterion

(1) If "β.Av" becomes "unity" i.e., "1". Then, Gain tends to
infinity and Oscillation starts.

(2) and angle between "β" and "Av" must be "0° or 360°"
 
Is This Answer Correct ?    8 Yes 8 No
Abdul Quadir Khumnai
 

 
 
 
Other Electronics Communications Interview Questions
 
  Question Asked @ Answers
 
countries implementing CDMA technology??   2
please send me PHOTON INFOTECH sample placement papers or pattern of the paper.very urgent.   1
Sir, I hav applied for the post of sec. engg in RRB in telecom-sigal domain. Can u suggest hows the question pattern. Do I hav 2 follow technical books or general aptitude books ? BSNL 2
In microprocessors, what does the mnemonic SKIP do? NTPC 2
how we can calculate antenna dimension for any em wave??   3
I want the technical question with answer for RRB J.E.exam RRB 1
what is embdeed system or device?   8
What is difference between aim & Target?   2
An FM receiver has an IF frequency that is A 88MHz-108MHz range B 540kHz-1640kHz range C 455kHz D 10.7MHz   2
why do u want to join in wipro? Wipro 6
16:16::25:? A]25 B]16 C]32 D]1 MahaGenco 2
How we add site in the BSC. NSN 4
 
For more Electronics Communications Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
   
Copyright © 2013  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  KalAajKal.com