current source for LDO's opamp

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jutek

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ldo opamp

hello

i need a current source for LDO's opamp. Vin changes from 1.3 to 3.3 so i need something voltage independent. simple use of resistor to create a reference current is very inacurrate.

what can i use with so high voltage change?
 

You can available from bandgap.I think
 

I think you can use constant gm bias circuit.You can refer razavi or John& martin for this.
 

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