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How to understand this transistor level analog circuit?

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bittware

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What's principle of this analog circuit?
0_1306589558.png
 

KerimF

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I may say... I simulated it and I couldn't find a well defined relation between Io and Iin. I thought it might be a more precise BJT low-level current mirror than the simpler versions, but I didn't get this result after simulation. Obviously if R is made larger, Io/Iin becomes smaller (though not constant for this circuit). Hope others could help you more.

Kerim
 

ninju

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looks like a current source. Try checking its temperature dependence.
 

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