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Newbie question: Is it possible to design band gap voltage ref without BJT?

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vadim888

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so my quiestion is:
is it possible to design bandgap voltage reference without BJT? only using MOS transistors.

if so, could you please give me a link to the solution
 

It is very possible:-D.
You can refer the paper " A bandgap voltage reference with only mos transistor" or search google to find more documents.
 
Yes, people often use the substrate PNP (because it happens
to be in the right electrical orientation for a ground-referred
bandgap design.

In standard Psub/Nwell CMOS, the P+/Nwell (which you want
for a groiund-referred design) is really a substrate PNP, no
getting around that (absent SOI or deep Nwell with enough
of a buried layer or retrograde doping that the PNP base is
effectively dead).
 
Hi,

What Dick-freebird said about substrate BJTs as bandgaps appears in the one called "Bandgap reference" on pages/slides 15 and 17 (17 is the parasitic PNP one), it has explanatory diagrams so I was able to understand it a bit.

MT-087 shows diferent ways of making them, not all were BJT-based.

View attachment MT-087.pdf

View attachment Bandgap-reference.pdf
 
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