Abstract Pole assignment techniques are effective in designing feedback controllers to obtain improved response of linear, time invariant dynamical systems. State feedback may pose problems in practical implementation. In such cases output feedback controllers have to be considered. From the viewpoint of satisfactory closed loop system performance assignment of closed loop poles at certain specified locations is not necessary. They may be required to be inside a specified sector in the left half plane. This not only ensures satisfactory system behaviour but also provides freedom in the choice of the feedback controller, both in the single and multi input cases. This freedom can be used to satisfy additional design criteria such as that the feedback gains or sensitivity of closed loop eigenvalues to specified system parameters should be minimum. A simple procedure is presented to design a minimum gain output feedback controller which assigns the closed loop poles into a specified sector. Numerical examples are given to illustrate the procedure.
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