DC-SQUID electronics based on the noise cancellation scheme

Research output: Contribution to journalArticleScientificpeer-review

31 Citations (Scopus)

Abstract

We have constructed a compact dc SQUID electronics unit, in which the noise of the room-temperature amplifier is measured by the SQUID and cancelled out. This makes it unnecessary to use a transformer and a modulation scheme to achieve noise matching between the SQUID and the amplifier. The electronics unit contains a PI/sup 3/2/-controller and it has demonstrated a bandwidth of 100 kHz, a 1.2 /spl mu//spl Phi//sub 0///spl radic/(Hz) white noise level and a 1/f noise corner of 0.3 Hz in a flux-locked loop mode. The design criteria for the noise-cancelled electronics are discussed, including the problem of excess noise.<>
Original languageEnglish
Pages (from-to)2146-2148
JournalIEEE Transactions on Applied Superconductivity
Volume5
Issue number2
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

Fingerprint

SQUIDs
cancellation
Electronic equipment
direct current
electronics
White noise
amplifiers
Modulation
Fluxes
Bandwidth
Controllers
white noise
transformers
controllers
bandwidth
modulation
room temperature
Temperature

Cite this

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title = "DC-SQUID electronics based on the noise cancellation scheme",
abstract = "We have constructed a compact dc SQUID electronics unit, in which the noise of the room-temperature amplifier is measured by the SQUID and cancelled out. This makes it unnecessary to use a transformer and a modulation scheme to achieve noise matching between the SQUID and the amplifier. The electronics unit contains a PI/sup 3/2/-controller and it has demonstrated a bandwidth of 100 kHz, a 1.2 /spl mu//spl Phi//sub 0///spl radic/(Hz) white noise level and a 1/f noise corner of 0.3 Hz in a flux-locked loop mode. The design criteria for the noise-cancelled electronics are discussed, including the problem of excess noise.<>",
author = "Mikko Kiviranta and Heikki Sepp{\"a}",
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journal = "IEEE Transactions on Applied Superconductivity",
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DC-SQUID electronics based on the noise cancellation scheme. / Kiviranta, Mikko; Seppä, Heikki.

In: IEEE Transactions on Applied Superconductivity, Vol. 5, No. 2, 1995, p. 2146-2148.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - DC-SQUID electronics based on the noise cancellation scheme

AU - Kiviranta, Mikko

AU - Seppä, Heikki

PY - 1995

Y1 - 1995

N2 - We have constructed a compact dc SQUID electronics unit, in which the noise of the room-temperature amplifier is measured by the SQUID and cancelled out. This makes it unnecessary to use a transformer and a modulation scheme to achieve noise matching between the SQUID and the amplifier. The electronics unit contains a PI/sup 3/2/-controller and it has demonstrated a bandwidth of 100 kHz, a 1.2 /spl mu//spl Phi//sub 0///spl radic/(Hz) white noise level and a 1/f noise corner of 0.3 Hz in a flux-locked loop mode. The design criteria for the noise-cancelled electronics are discussed, including the problem of excess noise.<>

AB - We have constructed a compact dc SQUID electronics unit, in which the noise of the room-temperature amplifier is measured by the SQUID and cancelled out. This makes it unnecessary to use a transformer and a modulation scheme to achieve noise matching between the SQUID and the amplifier. The electronics unit contains a PI/sup 3/2/-controller and it has demonstrated a bandwidth of 100 kHz, a 1.2 /spl mu//spl Phi//sub 0///spl radic/(Hz) white noise level and a 1/f noise corner of 0.3 Hz in a flux-locked loop mode. The design criteria for the noise-cancelled electronics are discussed, including the problem of excess noise.<>

U2 - 10.1109/77.403007

DO - 10.1109/77.403007

M3 - Article

VL - 5

SP - 2146

EP - 2148

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 2

ER -