The control of a linear time-invariant plant by a digital controller composed of a sampler, a periodic discrete-time component, and a zero-order hold is presented. The stability of such a configuration is analyzed. It is shown how closed-loop zeros can be placed using such a scheme. As a consequence, it is proved that the gain margin can be arbitrarily assigned by suitable choice of sampling time and digital controller. The design procedure is constructive, using state-space methods.
|Original language||English (US)|
|Number of pages||7|
|Journal||Proceedings of the American Control Conference|
|Volume||88 pt 1-3|
|State||Published - Dec 1 1988|