The effect is smaller than you might imagine, because many of parasitics can be modeled as adding additional basic elements and are understood fairly well. For

The effect is smaller than you might imagine, because many of parasitics can be modeled as adding additional basic elements and are understood fairly well. For example here is just some random model you could use for capacitor http://www.iequalscdvdt.com/cap_model.html http://www.iequalscdvdt.com/cap_model.html If simple lumped element model really fails to model your circuit, there is distributed element model which can analyze all sorts of RF voodoo https://en.m.wikipedia.org/wiki/Distributed-element_model https://en.m.wikipedia.org/wiki/Distributed-element_model and https://en.m.wikipedia.org/wiki/Distributed-element_circuit https://en.m.wikipedia.org/wiki/Distributed-element_circuit