Cryogenic Differential Amplifier for NMR Applications

We have designed and characterized a cryogenic amplifier for use in [Formula: see text] He NMR spectrometry. The amplifier, with a power consumption of [Formula: see text]  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...

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Detalles Bibliográficos
Autores principales: Zavjalov, V. V., Savin, A. M., Hakonen, P. J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6474854/
https://www.ncbi.nlm.nih.gov/pubmed/31073248
http://dx.doi.org/10.1007/s10909-018-02130-1
Descripción
Sumario:We have designed and characterized a cryogenic amplifier for use in [Formula: see text] He NMR spectrometry. The amplifier, with a power consumption of [Formula: see text]  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 [Formula: see text] 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 [Formula: see text] and a 4.4 MHz bandwidth starting from DC. At 1 MHz, the voltage and current noise amount to 1.3  [Formula: see text] and 12  [Formula: see text] , respectively, which yields an optimal source impedance of [Formula: see text]  k[Formula: see text] .

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