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# Hello, anyone can give me some advice?

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#### samuel

##### Full Member level 3
Now, Current is constant, for example, 64uA.
i want to design a circuit which can perform a function , for example,
you can selected abitrary current from 64uA.

thanks anyway.
samuel.

What do you mean?
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### samuel

Points: 2
hello, PaloAlto

i want to make sum of 320 infrared singals, then averege them, at last, take 60 percent of the average signal. each infrared singal is 300nA.

thanks again.

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Join them all into one single line
Use current mirrors to scale by 0.6
Now you have the (60%) sum of them all, if you scale it down 320 times, that's the average

That would give you the result, you need to calculate the error that the current mirrors are introducing to see whether it is feasible or not. Do some numbers and check it

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Now i want to arbitrarily take percent of the summation, for example,0.4 0.5,0.6.0.7 and so on by external control signal.

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