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Help me choose better current source

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demodb

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current source

which one of these is better, if we look at component characteristics and power supply?
 

Re: current source

demodb said:
which one of these is better, if we look at component characteristics and power supply?
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If you'v read book or lecture of Allen,might you can find some .
 

Re: current source

The second one has higher output resistance, but worse compliance.
 

Re: current source

If you use the first one, when Vdd change the current will change. If you use a PNP transistor and a resistor connected to the grounded the variation are less, because the transistor absorb part of the variation and the resistor voltage remain quite constant.
 

Re: current source

thx, for the help guys. Did help me a lot.
 

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