Answer Posted / mani
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°.
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