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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.
- Cryogenic amplifier
- Differential input
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Thanniyil Sebastian, A., Kaikkonen, J., Kamada, M., Manninen, J., Tan, Z., Will, M., Todoshchenko, I., Hakonen, P., Zavyalov, V., Sergeicheva, E., Song, X., Kumar, M., Pandey, P., Haque, M., Perelshtein, M., Kirsanov, N., Tong, F. & Korhonen, K.
05/11/2015 → 31/12/2021
Project: EU: ERC grants
01/01/2018 → 31/12/2020
Project: Academy of Finland: Other research funding