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How to design a current mirror circuit to bias a DAC?

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bias dac

After finished a DAC design, I found that the bandgap output voltage can not bias DAC directly. So I need a current mirror circuit to bias the current source array in DAC (current steering architecture) . This circuit can change the bandgap output voltage to current. A paper tell me this kind of bias method is more steady than voltage bias.

But, I can not find any paper or book of how to design this kind of circuit.

Please give me some help of design this bias circuit. I have a bandgap, just need a circuit can convert voltage to current.

Thanks.
 

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