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How to bias bandgap circuit?

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yxk

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bandgap circuit provide Voltage and current bias for other circuit.
but how to bias bandgap circuit? such as current mirror and error amp?
because the voltage of the circuit change from 2.5V to 5.5V, so the method with diode and resister divider are not effective, the current value change much with changement of the voltage?
so how can i do to bias the bangap circuit?

thanks
 

Usually bandgap circuits includes start up.
After start you can use self biasing.
 

thanks
 

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