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General Formulation of the Nyquist Criterion

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1 Author(s)

The Nyquist diagram technique is examined under very general assumptions; in particular, the linear subsystem is represented by a convolution operator, thus, the case of any linear time-invariant distributed circuit is included. It is shown that if there are no encirclements of the critical point, then the impulse response of the closed-loop system is bounded and absolutely integrable on[0, infty); it also tends to zero ast rightarrow infty. For any initial state, the zero-input response of the closed-loop system is also bounded and goes to zero. If, on the other hand, there are one or more encirclements of the critical point, then the closed-loop impulse response tends asymptotically to a growing exponential.

Published in:

Circuit Theory, IEEE Transactions on  (Volume:12 ,  Issue: 2 )

Date of Publication:

Jun 1965

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