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Why we always consider poles not zeros for system stability?

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lgpkarthi

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For system stability why we are always considering poles,whynot zeros?
 

Re: control system

Because in the transfer function poles occur at the denominator and for s = sp where sp represents a root at pole the tranfsfer function goes to infinity which leads to instability. Zeroes, on the other hand occur at the numerator and for any finite value of s transfer function cannot go to infinity. Hope it helps.
 

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