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Constant Current Source?

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mucko

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i wanna design a constant current source from 100 uA to 15 mA with DAC.Any idea to share?..

thanks in advance...
 

Use a current mirror and your DAC output and a resistor to supply the current to one side of the mirror.
 

Use bandgap to generate a constant voltage source. Using the output of bandgap to genegate the reference of your DAC by an external resistor. Then you can get a constant current source .


Yibin.
 

I have a question.
Can my input be a current?I use this current to mirror other current sources.
I am doing about dac.Or I must use bandgap reference.This is my confuse.
Thank you.
 

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