Some phenomena due to SQUID input properties when local feedback is present

Mikko Kiviranta; Leif Grönberg; Nikolay Beev; J van der Kuur

doi:10.1088/1742-6596/507/4/042017

Some phenomena due to SQUID input properties when local feedback is present

Mikko Kiviranta (Corresponding Author), Leif Grönberg, Nikolay Beev, J van der Kuur

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Abstract

We have constructed a two-stage SQUID amplifier, in which series-mixing local feedback has been used to screen the SQUID input inductances and hence to boost the power gain of the amplifier. 2.9 pA/Hz1/2 current noise and 2.9 nH input inductance of the lower SQUID stage imply energy resolution of 18 times Planck constant at 4.2 K, which, arguably, can be further improved by input inductance screening. The upper stage consists of a 184-series 4-parallel SQUID array, which, when used alone, shows lower than 0.03 µF 0/Hz1/2 flux noise, but which as a part of the two-stage amplifier is operated at a higher flux noise level to provide robust, EMI-tolerant output signal. The series-mixing feedback also facilitates negative SQUID input impedance, which would allow self-oscillating SQUID-based frequency domain multiplexing

Original language	English
Article number	042017
Journal	Journal of Physics: Conference Series
Volume	507
Issue number	Part 4
DOIs	https://doi.org/10.1088/1742-6596/507/4/042017
Publication status	Published - 2014
MoE publication type	A1 Journal article-refereed
Event	11th European Conference on Applied Superconductivity, EUCAS 2013 - Genoa, Italy Duration: 15 Sep 2013 → 19 Sep 2013 Conference number: 11

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Kiviranta, M., Grönberg, L., Beev, N., & van der Kuur, J. (2014). Some phenomena due to SQUID input properties when local feedback is present. Journal of Physics: Conference Series, 507(Part 4), [042017]. https://doi.org/10.1088/1742-6596/507/4/042017

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abstract = "We have constructed a two-stage SQUID amplifier, in which series-mixing local feedback has been used to screen the SQUID input inductances and hence to boost the power gain of the amplifier. 2.9 pA/Hz1/2 current noise and 2.9 nH input inductance of the lower SQUID stage imply energy resolution of 18 times Planck constant at 4.2 K, which, arguably, can be further improved by input inductance screening. The upper stage consists of a 184-series 4-parallel SQUID array, which, when used alone, shows lower than 0.03 µF 0/Hz1/2 flux noise, but which as a part of the two-stage amplifier is operated at a higher flux noise level to provide robust, EMI-tolerant output signal. The series-mixing feedback also facilitates negative SQUID input impedance, which would allow self-oscillating SQUID-based frequency domain multiplexing",

author = "Mikko Kiviranta and Leif Gr{\"o}nberg and Nikolay Beev and {van der Kuur}, J",

year = "2014",

doi = "10.1088/1742-6596/507/4/042017",

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journal = "Journal of Physics: Conference Series",

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AB - We have constructed a two-stage SQUID amplifier, in which series-mixing local feedback has been used to screen the SQUID input inductances and hence to boost the power gain of the amplifier. 2.9 pA/Hz1/2 current noise and 2.9 nH input inductance of the lower SQUID stage imply energy resolution of 18 times Planck constant at 4.2 K, which, arguably, can be further improved by input inductance screening. The upper stage consists of a 184-series 4-parallel SQUID array, which, when used alone, shows lower than 0.03 µF 0/Hz1/2 flux noise, but which as a part of the two-stage amplifier is operated at a higher flux noise level to provide robust, EMI-tolerant output signal. The series-mixing feedback also facilitates negative SQUID input impedance, which would allow self-oscillating SQUID-based frequency domain multiplexing

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10.1088/1742-6596/507/4/042017