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  • INTERVIEW QUESTIONS ELECTRONICS AND COMMUNICATION (EC) ENGINEERING DETAILS
    Question :
    What is Barkhausen criteria?
    Category Electronics and Communication (EC) Engineering Interview Questions
    Rating (0.2) By 261 users
    Added on 6/18/2011
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    Answers:

    Barkhausen criteria, without which you will not know which conditions, are to be satisfied for oscillations.
    ?Oscillations will not be sustained if, at the oscillator frequency, the magnitude of the product of the transfer gain of the amplifier and the magnitude of the feedback factor of the feedback network ( the magnitude of the loop gain ) are less than unity?.
    The condition of unity loop gain -Aβ = 1 is called the Barkhausen criterion. This condition implies that

    = 1and that the phase of - Aβ is zero.



    Barkhausen Criteria: For sustained oscillations
    1. The total phase shift around a loop is precisely 0 degree or 360 degree.
    2. The magnitude of the product of open loop gain of the amplifier and the magnitude of the feedback factor is unity.
    That is │Aβ│=1



    Posted by: chandan kumar jha    

    Contact chandan kumar jha Contact chandan kumar jha

    With reference to Electronics used for oscillators should satisfy
    1. |AB|=1
    2. Phase shift=0 or 360 degree between input and output



    Posted by: Mayur     

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