IOP equations:
This represents a set of linear equations. A solution exists if is full rank and ( columns of ) ( rows of A).
- ( rows of ) =
- ( columns of ) =
Then, we need:
We want greater than, not equal to, so that we have more flexibility when designing the controller.
Theorem: BIBO stability Stable
Suppose is real, rational, and proper. Then is stable if and only if is BIBO stable.
We will prove this for strictly proper.
First, we prove Stable BIBO stable.
- Given: is stable, real, rational and strictly proper.
- WTS: BIBO stable
Proof:
- Consider a bounded input signal which implies that such that . [definition of bounded]
- Let . Then:
Then, we prove BIBO stable.
- Given: is BIBO stable, real, rational and strictly proper.
- WTS: BIBO stable