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

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

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

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 languageEnglish
Article number042017
JournalJournal of Physics: Conference Series
Volume507
Issue numberPart 4
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed
Event11th European Conference on Applied Superconductivity, EUCAS 2013 - Genoa, Italy
Duration: 15 Sep 201319 Sep 2013
Conference number: 11

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inductance
amplifiers
power gain
acceleration (physics)
multiplexing
screening
impedance
output
energy

Cite this

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title = "Some phenomena due to SQUID input properties when local feedback is present",
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",
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Some phenomena due to SQUID input properties when local feedback is present. / Kiviranta, Mikko (Corresponding Author); Grönberg, Leif; Beev, Nikolay; van der Kuur, J.

In: Journal of Physics: Conference Series, Vol. 507, No. Part 4, 042017, 2014.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Some phenomena due to SQUID input properties when local feedback is present

AU - Kiviranta, Mikko

AU - Grönberg, Leif

AU - Beev, Nikolay

AU - van der Kuur, J

PY - 2014

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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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DO - 10.1088/1742-6596/507/4/042017

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