I copied the design from the TPS23758-EVM and measured some output ripple. The result is fine, but I don't understand it.
In school we're taught that a single connected line is the same voltage along the line. So I'm checking the output ripple along the Vout line and it's different at every point.
All the way from super noisy at D2, less noisy at Q1, and decreasing with each capacitor and more. That's a decrease of output ripple of 1.54v -> 224mv.
I understand how capacitance can smooth out the ripple, but am I seeing correctly that the ripple truly reduces along the length of the line? That's crazy!
What concept is this sorcery? :)