Question about n-order filters

Thread Starter


Joined Jun 6, 2011
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.