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Current reference source for a 2 stage operational amplifier

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hobbyiclearner

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Hello,

Can anyone suggest a simple current reference circuit for a two stage op amp. I need to generate constant current in uA range to be injected in the diode connected transistor and mirrored at both the stages.

Thanks,
Hobbyiclearner
 

Hi,

If you need a simple Current Source Reference independent of the supply voltage you can use the following scheme:

Reference Current Source.png

On the left the starting circuit is shown. The reference source circuit is on the right. Iref is the output current.

Greetings, I hope it meets your expectations.
 
Are there any references for the above circuit. Any books / name of the ckt etc.

Thanks.
 

This circuit is discussed in chapter 4 of the book Analog Design for CMOS VLSI Systems / Franco Maloberti.

4.2.3 Self Biased Micro-Current Generator
4.2.4 Start-up Circuits

* There is an error in the above scheme. The correct scheme is attached.Reference Current Source_V2.png
 

In Bakers book you can find a good description and info avout this circuit.
 

OK.. I will check them out and let you know.

Thanks,
Hobbyiclearner
 

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