# How to understand this transistor level analog circuit?

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#### bittware

##### Full Member level 4
What's principle of this analog circuit?

#### KerimF

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

##### Full Member level 3
looks like a current source. Try checking its temperature dependence.

#### Miguel Gaspar

It is necesary the transistor characteristics, β etc. For Q1, Q2, Q3 and Q4
Iin and R are also nedeed

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