I'm a first-year electrical engineering student and we have an exam coming up on active filters. Before studying engineering, I had played around with active filters, even designing and building a guitar pedal once that was essentially just a filter in a box.
My coming exam got me thinking, though: what is it about active filters that makes their response so fundamentally different to passive filters'?
For instance, the Chebyshev topology has passband ripple. Why? Why don't passive filters ever have passband ripple?
Nothing in my textbook explains this.