vivkr
|
PNPs have low beta. So you need to be careful and use a topology where this mismatch doesn't matter, e.g. use them as diodes. So technically, there is no difference between using PNPs and diodes. Of course, if you had fully floating vertical NPNs, that would be a different thing altogether.
I have to disagree with you about the modelling of PNPs. Usually, there are dedicated (poor performance yes, but dedicated) lateral PNPs expressly meant for making things like bandgap references. Standard PN diodes on the other hand are poorly modelled, and primarily for the reverse mode. So using them in bandgaps where the forward mode matters could be troublesome.
Vivek
|