Modelling current source with BJT

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Nerdie

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I have to design a current source, but in the process I should only use 1 bjt and the current source should be beta independent. How is it even possible?
 

Hint: The collector of a BJT has a high impedance and an emitter resistor provides feedback to stabilize the gain.
 

Ah thanks for the hint but doing it with a series of zener diodes at base worked out in simulation as well. Hope it will work in practice.
 

Nerdie said:
Ah thanks for the hint but doing it with a series of zener diodes at base worked out in simulation as well. Hope it will work in practice.
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Try varying the beta of the transistor and see what happens. You will find that circuit will not meet the beta independent requirement that you need for your current source.
 
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