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Need help to model op amp current source in block diagram

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Sebastie

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Hello,
I need to convert a little schematic for a current source with an op amp and a BJT to a block diagram in order to study the stability.
My concern is that I don't know how to model the transistor in the feedback loop.
Does someone know how I can do ?


Current_Source.jpg

Current_Source_Block_diagram.jpg

regards
 

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