Stabilizing a SQUID current amplifier in high magnetic fields

V. Shingla; E. Kleinbaum; L. N. Pfeiffer; K. W. West; G. A. Csáthy

doi:10.1088/1361-6501/aadbe1

Stabilizing a SQUID current amplifier in high magnetic fields

V. Shingla, E. Kleinbaum, L. N. Pfeiffer, K. W. West, G. A. Csáthy

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

SQUID-based galvanometers are unstable when connected to sources exposed to strong magnetic fields. We present a SQUID-based current amplifier with a 17 fA (√Hz)^-1 current noise, which is unconditionally stable with a source exposed to magnetic fields up to 10 T. Stability is achieved by inserting a four-pole low-pass filter between the source and the current amplifier. With this circuit, we demonstrate Johnson noise measurements below 1 K for source impedances in the kω range subjected to strong magnetic fields.

Original language	English (US)
Article number	105903
Journal	Measurement Science and Technology
Volume	29
Issue number	10
DOIs	https://doi.org/10.1088/1361-6501/aadbe1
State	Published - Sep 14 2018

All Science Journal Classification (ASJC) codes

Instrumentation
Engineering (miscellaneous)
Applied Mathematics

Keywords

dc SQUID
low noise current amplifier
two-dimensional electron gas

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10.1088/1361-6501/aadbe1

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abstract = "SQUID-based galvanometers are unstable when connected to sources exposed to strong magnetic fields. We present a SQUID-based current amplifier with a 17 fA (√Hz)-1 current noise, which is unconditionally stable with a source exposed to magnetic fields up to 10 T. Stability is achieved by inserting a four-pole low-pass filter between the source and the current amplifier. With this circuit, we demonstrate Johnson noise measurements below 1 K for source impedances in the kω range subjected to strong magnetic fields.",

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T1 - Stabilizing a SQUID current amplifier in high magnetic fields

AU - Shingla, V.

AU - Kleinbaum, E.

AU - Pfeiffer, L. N.

AU - West, K. W.

AU - Csáthy, G. A.

PY - 2018/9/14

Y1 - 2018/9/14

N2 - SQUID-based galvanometers are unstable when connected to sources exposed to strong magnetic fields. We present a SQUID-based current amplifier with a 17 fA (√Hz)-1 current noise, which is unconditionally stable with a source exposed to magnetic fields up to 10 T. Stability is achieved by inserting a four-pole low-pass filter between the source and the current amplifier. With this circuit, we demonstrate Johnson noise measurements below 1 K for source impedances in the kω range subjected to strong magnetic fields.

AB - SQUID-based galvanometers are unstable when connected to sources exposed to strong magnetic fields. We present a SQUID-based current amplifier with a 17 fA (√Hz)-1 current noise, which is unconditionally stable with a source exposed to magnetic fields up to 10 T. Stability is achieved by inserting a four-pole low-pass filter between the source and the current amplifier. With this circuit, we demonstrate Johnson noise measurements below 1 K for source impedances in the kω range subjected to strong magnetic fields.

KW - dc SQUID

KW - low noise current amplifier

KW - two-dimensional electron gas

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JO - Measurement Science and Technology

JF - Measurement Science and Technology

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ER -

Stabilizing a SQUID current amplifier in high magnetic fields

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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