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Wave Ripple observations

1. Neither the source nor load impedance dampen the 34% overshoot in the pulse response to the group time delay.
2. The wave output shape is controlled by the Bode Plot and limited BW of this LC Ladder Low Pass Filter and the amount of energy in the passband from a narrow pulse.
3. Mismatched source impedance does affect the amplitude after the source resistor.  Although the ladder filter is lossless, and minimum group delay it is high ripple
4. and the reflections of this pulse response from any mismatch of Zo=31.62 =sqrt(L/C)
5. The series diode is equally mismatched and far less effective than the R-D shunt diode attenuators for overshoot.
6. A Bessel  filter would result in no overshoot with a known group delay.

So far all is silent from the O.P.

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