52 views

The transfer function of a first-order controller is given as  $$G_{C}(s) = \dfrac{K(s+a)}{s+b}$$where $K,a$ and ܾ$b$ are positive real numbers. The condition for this controller to act as a phase lead compensator is

1. $a<b$
2. $a>b$
3. $K<ab$
4. $K>ab$