Proportional correction
Analog frequency correction

It is always useful to try out a simple proportional corrector C (p ) = A _c as it provides a good starting point for establishing the order of magnitude of the system's dynamic properties. It is often sufficient to meet the specifications.

The limitation is essentially this: if you have to increase the gain too much to satisfy the required precision, you'll usually end up with a control system that's too undamped or unstable.