Roff
Well-Known Member
We should keep in mind that if a resonant circuit is put in a feedback loop with an amplifier, then the loop will oscillate (assuming the loop gain is 1 or greater) when the total loop phase shift is zero (360) degrees. If the amplifier has infinite bandwidth (zero delay), then the resonant circuit phase shift must be either zero degrees (for a noninverting amplifier) or 180 degrees (for an inverting amplifier). A resonant network which does not pass through zero (or 180) degrees will not oscillate.
Perhaps the definition of resonance depends on the application.
Perhaps the definition of resonance depends on the application.