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- Title
Cryogenic Differential Amplifier for NMR Applications.
- Authors
Zavjalov, V. V.; Savin, A. M.; Hakonen, P. J.
- Abstract
We have designed and characterized a cryogenic amplifier for use in 3 He 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 k Ω .
- Subjects
DIFFERENTIAL amplifiers; ELECTRIC potential; SPECTROMETRY; WAGES
- Publication
Journal of Low Temperature Physics, 2019, Vol 195, Issue 1/2, p72
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-018-02130-1