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want help to design current source?

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niks

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Hi
i want to desing 20mA constat current source/sink circuit. My supply is varying from 2.2 - 3.4 Volts. Can anyone help me to design the same?
how can i maintain constant current throughout this supply range
its urgent
please help me
thanks
~niks~
 

try to use Band-gab circuit, it will provide constant voltage...and with some resistive network [MOS in linear] you will have constant current.
 

The transistor itself is a constant current source.
 

one more requirement i forget to tell that its quiscent current should be very low. say in few uA...
 

I think this circuit is your answer
please open attachment
vahid
 

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