Ultrastable low-noise current amplifier

An ultrastable low-noise current amplifier (ULCA) is presented. The ULCA is a non-cryogenic instrument based on specially designed operational amplifiers and resistor networks. It acts as a current-to-current amplifier or a current-to-voltage converter. Its transfer coefficient is extremely stable v...

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Bibliographic Details
Main Authors: Drung, Dietmar, Krause, Christian, Becker, Ulrich, Scherer, Hansjorg, Ahlers, Franz J.
Format: Conference Proceeding
Language:English
Subjects:
Ammeters
Amplifiers
Amplitudes
calibration
Coefficients
Current amplifiers
Current measurement
Direct current
Gain
Level (quantity)
measurement uncertainty
Networks
Noise
Operational amplifiers
precision measurements
Resistors
SQUIDs
Temperature measurement
Uncertainty
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Description
Summary:An ultrastable low-noise current amplifier (ULCA) is presented. The ULCA is a non-cryogenic instrument based on specially designed operational amplifiers and resistor networks. It acts as a current-to-current amplifier or a current-to-voltage converter. Its transfer coefficient is extremely stable versus time, temperature and current amplitude within the full dynamic range of ±13 nA. The concept aims at achieving an uncertainty of one part in 107 at direct currents of 100 pA. A cryogenic current comparator is used to calibrate both current gain and transresistance, providing traceability to the quantum Hall resistance. A low noise level of 2.4 fA/√Hz helps to keep averaging times low at small input currents.
ISSN:0589-1485
2160-0171
DOI:10.1109/CPEM.2014.6898556