your question is not clear enough,can you specify it?the schematic of your circuit is important.
the current of the bandgap reference which can be regulated by the resistor or the width vs length of the mosfets depends on the structure you introduced.it can be abtained easily by adjust the current mirror.1uA is not small enough for the low power design ,especially in the field of power management.You can get easilly.
Added after 50 seconds:
your question is not clear enough,can you specify it?the schematic of your circuit is important.
the current of the bandgap reference which can be regulated by the resistor or the width vs length of the mosfets depends on the structure you introduced.it can be abtained easily by adjust the current mirror.1uA is not small enough for the low power design ,especially in the field of power management.You can get easilly.