Barkhausen criterion

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Barkhausen criterion

[′bärk‚hau̇z·ən krī‚tir·ē·ən]
(electronics)
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(j ω) depends on frequency ω, then the loop will oscillate with a perfect sine wave at some frequency ω0 if at that frequency A β(j ω0) = 1 exactly, that is, if the magnitude of A β(j ω0) is exactly 1 and its phase is 0° or 360°.