"Arny Krueger"

These texts seem to be promulgating a misapprehension. The misapprehension
seems to be that all reproduced square waves with ripples in or around
them, have those ripples because of ringing. Just because a reproduced
square wave has ripples in or around it, is not evidence of ringing.


** The term "ripples" refers to cyclic variations in the gain of a ( LP)
filter in the pass or stop bands.

Various classes of filter have either none, one or the other or both.

Wiki has some good info on this.


Ringing is a very specific thing - it is a resonance.


** Not true.

The term " ringing " has more than one meaning in electronics.

It mostly refers to any visible overshoot and oscillation pattern with a
step input to a circuit - whether or not related to an actual peak in the
pass band gain.



...... Phil