How does one go about accurately setting reference voltages at various points in a given circuit (e.g. various threshold voltages). Obviously we can have a potential divider from the main power supply but that generally tends to fluctuate a lot, not to mention noise from other parts of the circuit.
I would assume a sort of single voltage reference from which we can derive the rest of the references. Does one use potential dividers after that? Or are there any smarter methods?