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

Mikko Kiviranta; Leif Grönberg; Nikolai Beev; Jan 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, Nikolai Beev, Jan van der Kuur

Netherlands Institute for Space Research (SRON)

Research output: Contribution to journal › Article in a proceedings journal › Scientific › peer-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/Hz^1/2 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 µΦ₀/Hz² 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	A4 Article in a conference publication
Event	11th European Conference on Applied Superconductivity, EUCAS 2013 - Genoa, Italy Duration: 15 Sept 2013 → 19 Sept 2013 Conference number: 11

Access to Document

10.1088/1742-6596/507/4/042017Licence: CC BY

Cite this

@article{17ceaf4c97234c6cb73b6bfd4f9b895b,

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 µΦ0/Hz2 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 Nikolai Beev and {van der Kuur}, Jan",

year = "2014",

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

language = "English",

volume = "507",

journal = "Journal of Physics: Conference Series",

issn = "1742-6588",

publisher = "Institute of Physics IOP",

number = "Part 4",

note = "11th European Conference on Applied Superconductivity, EUCAS 2013, EUCAS 2013 ; Conference date: 15-09-2013 Through 19-09-2013",

}

TY - JOUR

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

AU - Kiviranta, Mikko

AU - Grönberg, Leif

AU - Beev, Nikolai

AU - van der Kuur, Jan

N1 - Conference code: 11

PY - 2014

Y1 - 2014

N2 - 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 µΦ0/Hz2 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

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 µΦ0/Hz2 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

U2 - 10.1088/1742-6596/507/4/042017

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

M3 - Article in a proceedings journal

SN - 1742-6588

VL - 507

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - Part 4

M1 - 042017

T2 - 11th European Conference on Applied Superconductivity, EUCAS 2013

Y2 - 15 September 2013 through 19 September 2013

ER -

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

Abstract

Access to Document

Fingerprint

Cite this