Cryogenic bipolar low noise dc amplifier for low frequency applications
- 作者: Novikov I.L.1, Vol’khin D.I.1, Vostretsov A.G.1,2,3
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隶属关系:
- Novosibirsk State Technical University
- Federal State Budgetary Institution of Science
- Institute of Mining named after. N. A. Chinakala Siberian Branch of the Russian Academy of Sciences
- 期: 卷 69, 编号 1 (2024)
- 页面: 88-98
- 栏目: НОВЫЕ РАДИОЭЛЕКТРОННЫЕ СИСТЕМЫ И ЭЛЕМЕНТЫ
- URL: https://journal-vniispk.ru/0033-8494/article/view/259730
- DOI: https://doi.org/10.31857/S0033849424010078
- EDN: https://elibrary.ru/KZSOZZ
- ID: 259730
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详细
A low-noise bipolar differential dc amplifier was studied at temperatures of 300 and 77 K. It was shown that to ensure the best amplifier performance in terms of noise figure when the operating temperature decreases from 300 to 77 K, it is advisable to use the transistor in the mode of low currents not exceeding 2 mA. It has been established that lowering the operating temperature to 77 K leads to a decrease in the input resistance of the amplifier from a value of several kiloohms to 100 Ohms, the dynamic range increases from 80 to 85 dB, and the harmonic coefficient increases from 0.09% to 1%. In addition, lowering the operating temperature to 77 K has a significant effect on the noise properties of the amplifier: the spectral density of voltage noise decreases from 1 to 0.4 nV/Hz1/2, the spectral density of current noise increases from 2.5 to 9 pA/Hz1/2, while also The threshold frequencies of 1/f noise increase: for voltage from (0.1...10) to 20 Hz and for current from (10...100) to 1000 Hz. The possibility of using an amplifier for low-temperature measurements of samples with low input resistance is substantiated.
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作者简介
I. Novikov
Novosibirsk State Technical University
Email: vostreczov@corp.nstu.ru
俄罗斯联邦, K. Marx avenue 20, Novosibirsk, 630073
D. Vol’khin
Novosibirsk State Technical University
Email: vostreczov@corp.nstu.ru
俄罗斯联邦, K. Marx avenue 20, Novosibirsk, 630073
A. Vostretsov
Novosibirsk State Technical University; Federal State Budgetary Institution of Science; Institute of Mining named after. N. A. Chinakala Siberian Branch of the Russian Academy of Sciences
编辑信件的主要联系方式.
Email: vostreczov@corp.nstu.ru
俄罗斯联邦, K. Marx avenue 20, Novosibirsk, 630073; Krasny Ave., 54, Novosibirsk, 630091
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