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constant power bias source

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solidstate

solidstate

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Hi all,

I'm trying to design a bias source that outputs a current such that Iout * VDD is constant (within 5%). Nominal VDD is 5V.
One idea I have is comparing a scaled down version of vdd with a bandgap, and using the difference to do some (open-loop) current adjustment. Maybe some of you have some other ideas?

Thanks in advance!
 

Doesn't work without an analog multiplier or divider, respectively a circuit with similar properties. But feasible anyway.
 

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