Stable vs. Unstable vs. Oscillation

1. 이론적 배경

Barkhausen Criterion, Nyquist Stability Criterion은 Stable과 Unstable을 판별하는 기준이다.

즉, 이 둘은 Oscillation의 필수조건에 해당한다고 할 수 있다.

Barkhausen's criterion is a necessary condition for oscillation but not a sufficient condition: some circuits satisfy the criterion but do not oscillate.[5] Similarly, the Nyquist stability criterion also indicates instability but is silent about oscillation. Apparently there is not a compact formulation of an oscillation criterion that is both necessary and sufficient.[6]

Barkhausen stability criterion - Wikipedia

2. Unstable vs. Oscillation

 

 

electrical engineering - If a control system is unstable does it mean it will oscillate? - Engineering Stack Exchange

If a control system is unstable does it mean it will oscillate?

Electronic Control Theory of Second-Order Systems: A Practical Analysis for Engineers | Analog Devices

3. Potentially Unstable vs. Unconditionally Stable

A transistor that is not unconditionally stable is usually described as a “potentially unstable” device.

Potentially Unstable ∋ Oscillation, Unstable, Conditionally Stable

Unconditional Stability and Potential Instability in RF Amplifier Design - Technical Articles (allaboutcircuits.com)