# Zero-Pole Cancellation in Transfer Functions

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When the transfer function of a system has poles in the right half-plane of the complex numbers, the system is unstable. While it is theoretically possible to design a proportional-derivative (PD) compensator to cancel the poles, in practice is it is difficult to create perfect pole-zero cancellation due to imprecision in the model.

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Contributed by: Hugo Tadashi (March 2011)

Open content licensed under CC BY-NC-SA

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