Ultralow noise current amplifier based on a cryogenic current comparator

Authors
Gay, F Piquemal, F Geneves, G
Citation
F. Gay et al., Ultralow noise current amplifier based on a cryogenic current comparator, REV SCI INS, 71(12), 2000, pp. 4592-4595
Citations number
15
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
REVIEW OF SCIENTIFIC INSTRUMENTS
ISSN journal
00346748 → ACNP
Volume
71
Issue
12
Year of publication
2000
Pages
4592 - 4595
Database
ISI
SICI code
0034-6748(200012)71:12<4592:UNCABO>2.0.ZU;2-S
Abstract
This article describes the development of a current amplifier operating at 4.2 K designed for very low current measurements. A cryogenic current compa rator with a winding ratio of 10 000/1, a low noise dc superconducting quan tum interference device, and a very efficient magnetic shield are combined to reach an equivalent input noise of 4 fA/root Hz in the signal bandwidth and a flicker noise corner around 0.5 Hz. (C) 2000 American Institute of Ph ysics. [S0034-6748(00)05012-7].