Ultralow noise current amplifier based on a cryogenic current comparator

被引：35
|
作者：
Gay, F [1 ]
Piquemal, F [1 ]
Genevès, G [1 ]
机构：
[1] Bur Natl Metrol, Lab Cent Ind Elect, F-92260 Fontenay Aux Roses, France
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2000年 / 71卷 / 12期
关键词：
D O I：
10.1063/1.1326054
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
This article describes the development of a current amplifier operating at 4.2 K designed for very low current measurements. A cryogenic current comparator with a winding ratio of 10 000/1, a low noise dc superconducting quantum 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 Physics. [S0034-6748(00)05012-7].
引用
收藏
页码：4592 / 4595
页数：4
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