Cryogenic Differential Amplifier for NMR Applications

V. V. Zavjalov; A. M. Savin; P. J. Hakonen

doi:10.1007/s10909-018-02130-1

Cryogenic Differential Amplifier for NMR Applications

V. V. Zavjalov^*, A. M. Savin, P. J. Hakonen

^*Corresponding author for this work

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

4 Citations (Scopus)

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Abstract

We have designed and characterized a cryogenic amplifier for use in ³He NMR spectrometry. The amplifier, with a power consumption of ∼ 2.5 mW, works at temperatures down to 4 K. It has a high-impedance input for measuring a signal from NMR resonant circuit, and a 50 Ω differential input which can be used for pick-up compensation and gain calibration. At 4.2 K, the amplifier has a voltage gain of 45, output resistance 146 Ω and a 4.4 MHz bandwidth starting from DC. At 1 MHz, the voltage and current noise amount to 1.3 nV/Hz and 12 fA/Hz, respectively, which yields an optimal source impedance of ∼ 100 kΩ.

Original language	English
Number of pages	9
Journal	Journal of Low Temperature Physics
DOIs	https://doi.org/10.1007/s10909-018-02130-1
Publication status	Published - 2018
MoE publication type	A1 Journal article-refereed

Keywords

Cryogenic amplifier
Differential input
HEMT
Low-noise

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10.1007/s10909-018-02130-1

Zavjalov2018_Article_CryogenicDifferentialAmplifierFinal published version, 1.03 MBLicence: CC BY

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@article{33ddef4d88894eb084e4b5ec7e96635d,

title = "Cryogenic Differential Amplifier for NMR Applications",

abstract = "We have designed and characterized a cryogenic amplifier for use in 3He NMR spectrometry. The amplifier, with a power consumption of ∼ 2.5 mW, works at temperatures down to 4 K. It has a high-impedance input for measuring a signal from NMR resonant circuit, and a 50 Ω differential input which can be used for pick-up compensation and gain calibration. At 4.2 K, the amplifier has a voltage gain of 45, output resistance 146 Ω and a 4.4 MHz bandwidth starting from DC. At 1 MHz, the voltage and current noise amount to 1.3 nV/Hz and 12 fA/Hz, respectively, which yields an optimal source impedance of ∼ 100 kΩ.",

keywords = "Cryogenic amplifier, Differential input, HEMT, Low-noise",

author = "Zavjalov, {V. V.} and Savin, {A. M.} and Hakonen, {P. J.}",

note = "| openaire: EC/H2020/670743/EU//QuDeT ",

year = "2018",

doi = "10.1007/s10909-018-02130-1",

language = "English",

journal = "Journal of Low Temperature Physics",

issn = "0022-2291",

publisher = "Springer",

}

TY - JOUR

T1 - Cryogenic Differential Amplifier for NMR Applications

AU - Zavjalov, V. V.

AU - Savin, A. M.

AU - Hakonen, P. J.

N1 - | openaire: EC/H2020/670743/EU//QuDeT

PY - 2018

Y1 - 2018

N2 - We have designed and characterized a cryogenic amplifier for use in 3He NMR spectrometry. The amplifier, with a power consumption of ∼ 2.5 mW, works at temperatures down to 4 K. It has a high-impedance input for measuring a signal from NMR resonant circuit, and a 50 Ω differential input which can be used for pick-up compensation and gain calibration. At 4.2 K, the amplifier has a voltage gain of 45, output resistance 146 Ω and a 4.4 MHz bandwidth starting from DC. At 1 MHz, the voltage and current noise amount to 1.3 nV/Hz and 12 fA/Hz, respectively, which yields an optimal source impedance of ∼ 100 kΩ.

AB - We have designed and characterized a cryogenic amplifier for use in 3He NMR spectrometry. The amplifier, with a power consumption of ∼ 2.5 mW, works at temperatures down to 4 K. It has a high-impedance input for measuring a signal from NMR resonant circuit, and a 50 Ω differential input which can be used for pick-up compensation and gain calibration. At 4.2 K, the amplifier has a voltage gain of 45, output resistance 146 Ω and a 4.4 MHz bandwidth starting from DC. At 1 MHz, the voltage and current noise amount to 1.3 nV/Hz and 12 fA/Hz, respectively, which yields an optimal source impedance of ∼ 100 kΩ.

KW - Cryogenic amplifier

KW - Differential input

KW - HEMT

KW - Low-noise

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U2 - 10.1007/s10909-018-02130-1

DO - 10.1007/s10909-018-02130-1

M3 - Article

AN - SCOPUS:85058714705

SN - 0022-2291

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

ER -

Cryogenic Differential Amplifier for NMR Applications

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Cryogenic Differential Amplifier for NMR Applications

Abstract

Keywords

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Finnish Centre of Excellence in Quantum Technology

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QuDeT: Quantum devices in topological matter: carbon nanotubes, graphene, and novel superfluids

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OtaNano

OtaNano – Low Temperature Laboratory

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