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Ultralow Current Measurements With Silicon-on-Sapphire Integrator Circuits

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3 Author(s)
Eugenio Culurciello ; Dept. of Electr. Eng., Yale Univerity, New Haven, CT ; Hazael Montanaro ; Dongsoo Kim

This letter reports the results on measurements and modeling of the ultralow current measurement capability of a silicon-on-sapphire current integrator circuit. We have tested the lowest possible current measurable with the device and the noise performance with picoampere input currents. The device is capable of resolving subpicoampere currents with an rms noise of 350 fA in a 110-Hz bandwidth. The device is also capable of digitally measuring currents up to 100 muA by employing a pulse-based A/D converters.

Published in:

IEEE Electron Device Letters  (Volume:30 ,  Issue: 3 )