Olin writes:
> Do you at least agree that if the driver has finite impedence, then just
> adding the two capacitors is not valid?

The driver does not have finite impedence, especially the further from DC
you get. And this is at 20MHz!

The Z of a 33pF cap at 20MHz is somewhere around 200 Ohms. The output Z of
the PIC at that frequency is at least that. And it's not capacitive.

Certainly it can be complicated if you want to make it complicated.

Nice try though.

Cheerful regards,

Bob


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