Say we live in a world where p-type carriers just have more mobility and therefore switches faster than n-types, so we'll favour PNP's and PMOS's. So in such circuits, we reference everything from the supply with more positive electric potential, instead of ground. What kind of system to we call those types??
I've been Googling for techniques with that sort of system, but it's coming out with nothing.
EDIT: In case anybody asks why I needed to know, I simply need to invert an analog signal from Vx voltage from ground to same voltage difference in reference from Vsupply. I'm working with MOSFETs and please don't ask me to use a Common Source or a ready made Opamp.