yvkrishna
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Hi James,
I assume this is simple BGR design without any curvature compensation used.
o/p voltage will not exactly be 1.205 for every process(depends on lot of things) but usually close it if you design a classical voltage bandgap.
Tolerance is always about the total variations with PVT, absolute value is usually easy to trim and control.
And about curvature facing upwards, it might be to do with the BJT used, did you try to observe if BJT alone has proper temperature characterless.(CTAT nature) use a different bjt/diode and double check.
you can post your schematic for better replies to your queries.
Regards, yvkrishna
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