Cryogenic Differential Amplifier for NMR Applications

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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
157 Downloads (Pure)


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 languageEnglish
Number of pages9
JournalJournal of Low Temperature Physics
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed


  • Cryogenic amplifier
  • Differential input
  • HEMT
  • Low-noise


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