precision current source

[lennybogzy]

an application i'm working on requires 1.35 yoctoamps with a tolerance of + or - 0.10yoctoamps.

Any current-source reccomendations?

[gnurf]

an application i'm working on requires 1.35 yoctoamps with a tolerance of + or - 0.10yoctoamps.

Keithly's sourcemeters go down to femtoamperes (one retailer sells them for 13000$)... What kind of application requires yoctoamperes, if I may ask? If such a source exists, you're probably gonna have to pay megadollars to get one. Good luck.

[gnurf]

By the way:

1A = 1C/s = 6.24*1018 electrons per second.

You're asking for a source that sources 10-24 amperes, or about an electron every other day?