![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
For a large value of the gain K, the system is unstable. As the gain K is decreased to a certain value, the G(jω) locus passes through the –1+j0 point. This means that with this gain value the system is on the verge of instability, and the system will exhibit sustained oscillations. For a small value of the gain K, the system is unstable.