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What's the purpose of this circuit?

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sys_eng

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cir1.png

1)It looks like it has 2 diode connected transistor but the top one has a resistor R17 inside, what purpose is that?
2)10uA dc current source causes a 1.3V drop, why?
 

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sys_eng said:
1)It looks like it has 2 diode connected transistor but the top one has a resistor R17 inside, what purpose is that?
Click to expand...
To achieve a (somewhat) higher Vgs - in comparison to a purely diode connected circuit.


sys_eng said:
2)10uA dc current source causes a 1.3V drop, why?
Click to expand...
Why not? A current source ("infinite" impedance!) takes all the voltage which isn't needed by the circuit which it supplies.
 

erikl said:
To achieve a (somewhat) higher Vgs - in comparison to a purely diode connected circuit.



Why not? A current source ("infinite" impedance!) takes all the voltage which isn't needed by the circuit which it supplies.
Click to expand...

1)what advantage is a higher Vgs?
 

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