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The best way is to use a current mirror: It's made like an ECL port with the base of one transistor shorted with it's collector and a load on the collector of the other (Try to make a search for current mirror circuit). By acting on some parameters of this scheme you can make a certain current and duplicate it (even a fraction of it) with a very good accurancy. This is used into DAC IC to stabilize their performances against ageing and temp. drift.
Bye Mrm
Using CMOS current mirror can also achieve such accuracy. At least a current output unit of a few pico Ampere is possible, whereby the MOSFET operates probably in the sub-threshold regime.
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