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I am trying to learn about lead compensators from an online resource,but two different articles of same resource mention different expressions of lead compensator, i have also attached snapshots for both links and highlighted the relevant spots

https://ctms.engin.umich.edu/CTMS/index.php?aux=Extras_Leadlag

https://ctms.engin.umich.edu/CTMS/index.php?example=BallBeam&section=ControlFrequency#5 enter image description here

enter image description here

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  • \$\begingroup\$ First case: a<1 and second case: a>1. \$\endgroup\$ – LvW Dec 16 '20 at 15:52
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There is no standard. People use the form they think works best in a particular situation, or what they were taught back in the day, or what they feels best makes the point of the lesson they're teaching.

The things that actually matter are the pole and zero location, and the overall gain (although you may end up expressing that gain at DC, at high frequencies, or even in rare circumstance along the rising amplitude vs. frequency slope).

Just get used to different authors saying the same things at different times. Sometimes it's a pain -- sometimes it gives you more insight into a subject.

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