Re: Can I design a typical bandgap voltage reference with NP
I'm not sure that your process has the luxury of NPN but not the substrate PNPs.
Coming to the schematic, your reference is referred to the supply instead of ground.
If you use the PTAT current and generate the reference wrt ground you wont see huge supply dependence.
When I was working in bipolar technologies, we used
nothing but NPNs for the reference elements. You pick
the best from what's in the basket you are given.