A traceable precision current source for currents between 100 aA and 10 pA

@article{Willenberg2002ATP,
  title={A traceable precision current source for currents between 100 aA and 10 pA},
  author={Gerd-Dietmar Willenberg and H. N. Tauscher and Peter Warnecke},
  journal={Conference Digest Conference on Precision Electromagnetic Measurements},
  year={2002},
  pages={158-}
}
We present a new traceable calibration source for small currents in the range from 100 aA to 10 pA. An extremely stable output current is achieved by use of a newly developed precision voltage ramp generator. 
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