Help me with meeting the threshold voltage requirement of a POR circuit

[refunok]

i've designed a POR circuit with diode connected PMOS+inverter+hysteresis+delay structure. then the rise and fall threshold voltage of the POR change a lot with different processes and temperatures. But in the spec, the threshold voltage should be kept in a small range at all corners. and the current consumption must be less than 10uA with the voltage supply of 5V.
so what about the bandgap+resistor divider+comparator+delay structure? can i try this structure to meet the threshold voltage requirement? if so, then what about the power requirement? is it difficult to design a bandgap+resistor divider+comparator+delay structure POR with current consumption less than 10uA?
or should i insist on the prior easier structure, but how to meet the threshold voltage requirement?
someone can help me? thanks in advance

 

[dick_freebird]

Re: need help about POR

You can make simple PORs that work well, but will have
a lot of PVT variation. I recommend pushing back on the
requirements because the POR function probably does not
need any kind of accuracy - only to release above where
logic becomes certainly-functional, and below rated min
operating VDD.