Cryogenic Differential Amplifier for NMR Applications
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2018
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Language
en
Pages
9
Series
Journal of Low Temperature Physics
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.Description
| openaire: EC/H2020/670743/EU//QuDeT
Keywords
Cryogenic amplifier, Differential input, HEMT, Low-noise
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Citation
Zavjalov, V V, Savin, A M & Hakonen, P J 2018, ' Cryogenic Differential Amplifier for NMR Applications ', Journal of Low Temperature Physics . https://doi.org/10.1007/s10909-018-02130-1