Passivity, Stability and Circle Criterion

This lecture covers the concepts of passivity, absolute stability, and the circle criterion. It explains the necessary conditions for absolute stability, the relationship between passivity and stability, and the criteria for determining stability in linear systems with feedback. The instructor discusses the implications of non-linearity on system stability and introduces the concept of absolute stability. The lecture concludes with an explanation of how to ensure stability in feedback systems with non-linear elements.