Hi guys, what does it mean to observe a filter response to a unit step? The book gives a transfer function and I've recreated it in Proteus ISIS. Now it asks me to simulate a square wave as an input (i used a pulse generator), and then observe a filter response to a unit step, describing the results. I'm at a loss here - what exactly am I supposed to be describing. The output from my ISIS design is a square wave, but that's about it - what am I supposed to describe about that? Am I on the right track here or am I supposed to be doing something else?