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Question
what is Barkhausen Criterion?
 Question Submitted By :: Lshalu85
I also faced this Question!!     Rank Answer Posted By  
 
  Re: what is Barkhausen Criterion?
Answer
# 1
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
 
  Re: what is Barkhausen Criterion?
Answer
# 2
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
 
 
 
  Re: what is Barkhausen Criterion?
Answer
# 3
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
 
  Re: what is Barkhausen Criterion?
Answer
# 4
the magnitude of AB is greater than equal to 1
which angle is 0 to 360 degree
 
Is This Answer Correct ?    23 Yes 11 No
Omjee
 
  Re: what is Barkhausen Criterion?
Answer
# 5
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
 
  Re: what is Barkhausen Criterion?
Answer
# 6
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
 
  Re: what is Barkhausen Criterion?
Answer
# 7
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
 
  Re: what is Barkhausen Criterion?
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 ?    9 Yes 4 No
Mani
 
  Re: what is Barkhausen Criterion?
Answer
# 9
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
 
  Re: what is Barkhausen Criterion?
Answer
# 10
The condition for which oscillation takes place in a
oscillater is known as The Barkhausen Criterion

*SO the total loop gain should be 360 or 0 degree.
 
Is This Answer Correct ?    3 Yes 9 No
Debasis Pany
 

 
 
 
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