I was reading about lead compensator from a website but i am not able to understand how they have extracted zero and pole from transfer function of lead compensator as shown in attached photo?

or they have extracted/calculated wrong values of zeros and poles?

enter image description here


You're right, the given pole and zero are wrong. They should be




because for $s=s_0$ the numerator becomes zero, and for $s=s_{\infty}$ the denominator becomes zero.


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