Ultrastable low-noise current amplifier

Author

Drung, Dietmar ; Krause, Christoph ; Becker, Ulrich ; Scherer, Hansjorg ; Ahlers, Franz J.

Author_Institution

Phys.-Tech. Bundesanstalt, Berlin, Germany

fYear

2014

fDate

24-29 Aug. 2014

Firstpage

656

Lastpage

657

Abstract

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.

Keywords

calibration; circuit noise; cryogenic electronics; current comparators; electric current measurement; gain measurement; low noise amplifiers; operational amplifiers; power convertors; resistors; ULCA; calibration; cryogenic current comparator; current 100 pA; current measurement; current-to-current amplifier; current-to-voltage converter; gain measurement; noncryogenic instrument; operational amplifier; quantum Hall resistance; resistor network; transfer coefficient; ultrastable low-noise current amplifier; Current measurement; Noise; Operational amplifiers; Resistors; SQUIDs; Temperature measurement; Uncertainty; Ammeters; calibration; current measurement; measurement uncertainty; precision measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements (CPEM 2014), 2014 Conference on

Conference_Location

Rio de Janeiro

ISSN

0589-1485

Print_ISBN

978-1-4799-5205-2

Type

conf

DOI

10.1109/CPEM.2014.6898556

Filename

6898556