I know that an RC low pass filter has a rise-time computed as (ln(0.9)-ln(0.1))RC, or approximately 2.2RC.

When adding additional orders to the filter -- or changing the response (i.e Bessel, Chebyshev, etc.) -- what is the effect on the rise-time computation?

Sorry, I'm too tired to do the math today.

 

https://en.wikipedia.org/wiki/Rise_time#Simple_examples_of_calculation_of_rise_time



Note that is isolated stages, not RC Ladder.

Ladder delay -

http://www.inf.ufsc.br/~luiz.santos/ine5442/slides/aulas15-16.pdf

http://digital-library.theiet.org/content/journals/10.1049/piee.1977.0204


Regards, Dana.