Bode's integral theorem for discrete-time systems

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Bode's integral theorem for discrete-time systems

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A paper by Bode has shown the limitations of using a feedback structure in terms of an integral constraint on the sensitivity function for open-loop stable continuous-time systems. The paper by Mohtadi examines and derives equivalent results for discrete-time feedback systems. These integral constraints also provide some guidelines regarding the philosophy of feedback design specifically for sampled-data systems. For example, it is shown that, for all sampled-data control systems, there is a maximum sampling frequency, beyond which little improvement in performance is gained.

Inspec keywords: integration; feedback; discrete time systems

Other keywords: Bode theorem; open-loop stable continuous-time systems; sensitivity function; feedback design philosophy; discrete-time feedback systems; integral theorem; sampled-data control systems; sampling frequency; feedback structure; integral constraint

Subjects: Mathematical analysis; Discrete control systems

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