A femto ampere current amplifier based on a 30 000∶1 cryogenic current comparator

Author

Rengnez, F. ; Seron, O. ; Devoille, L. ; Placko, D. ; Piquemal, F.

Author_Institution

LNE, Trappes, France

fYear

2014

fDate

24-29 Aug. 2014

Firstpage

296

Lastpage

297

Abstract

A Cryogenic Current Comparator (CCC) used as a SET current amplifier with a maximum current ratio of 30 000 : 1 has been developed at LNE. The equivalent input current noise was found lower than 2 fA/Hz^1/2 over a frequency range 1 Hz to 350 Hz in both operating modes. A new matrix method allows the analytical determination of the electrical behavior of the CCC to estimate the AC current ratio error. The error on 30 000:1 ratio is estimated less 10^-8 at 1 Hz.

Keywords

amplifiers; circuit noise; cryogenic electronics; current comparators; electric current measurement; AC current ratio error estimation; CCC; LNE; SET current amplifier; cryogenic current comparator; current measurement; equivalent input current noise; femtoampere current amplifier; frequency 1 Hz to 350 Hz; matrix method; Cryogenics; Current measurement; Electrical resistance measurement; Impedance; Resonant frequency; SQUIDs; Windings; Cryogenic Current Comparator (CCC); low current metrology; single electron tunneling; small-current measurement;

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.2014.6898376

Filename

6898376