Use of SiGe bipolar transistors for cryogenic readout of SQUIDs

Mikko Kiviranta (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)

Abstract

We have measured characteristics and noise of four commercially available SiGe heterojunction bipolar transistors at 4.2 K. One device exhibits 75 pV Hz−1/2 white noise and a 1/f noise corner of 20 kHz at 9 mW power dissipation, proving suitable for readout of SQUIDs immersed in liquid He. Another device exhibits 370 pV Hz−1/2 white noise and a 1/f noise corner of 5 kHz at 50 µW dissipation, and still gives useable gain at 7 µW dissipation. This device is useful for SQUID multiplexers intended for closed-cycle refrigerators, in which the cooling power is limited. The achievable dissipation is even compatible for operation in the low-temperature stages of dilution refrigerators or ADRs. Furthermore, SiGe-based dc SQUID readout with 0.35 μΦ0 Hz−1/2 flux noise was demonstrated. Applying negative flux feedback yielded a slew rate exceeding 50Φ0 μs−1.
Original languageEnglish
Pages (from-to)1297-1302
Number of pages6
JournalSuperconductor Science and Technology
Volume19
Issue number12
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

SQUIDs
Bipolar transistors
bipolar transistors
Cryogenics
cryogenics
readout
dissipation
White noise
refrigerators
Closed cycle machinery
white noise
Fluxes
Refrigerators
Heterojunction bipolar transistors
closed cycles
Dilution
Energy dissipation
multiplexing
Cooling
Feedback

Keywords

  • SQUID
  • multiplexers
  • bipolar transistors
  • superconducting transistors

Cite this

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title = "Use of SiGe bipolar transistors for cryogenic readout of SQUIDs",
abstract = "We have measured characteristics and noise of four commercially available SiGe heterojunction bipolar transistors at 4.2 K. One device exhibits 75 pV Hz−1/2 white noise and a 1/f noise corner of 20 kHz at 9 mW power dissipation, proving suitable for readout of SQUIDs immersed in liquid He. Another device exhibits 370 pV Hz−1/2 white noise and a 1/f noise corner of 5 kHz at 50 µW dissipation, and still gives useable gain at 7 µW dissipation. This device is useful for SQUID multiplexers intended for closed-cycle refrigerators, in which the cooling power is limited. The achievable dissipation is even compatible for operation in the low-temperature stages of dilution refrigerators or ADRs. Furthermore, SiGe-based dc SQUID readout with 0.35 μΦ0 Hz−1/2 flux noise was demonstrated. Applying negative flux feedback yielded a slew rate exceeding 50Φ0 μs−1.",
keywords = "SQUID, multiplexers, bipolar transistors, superconducting transistors",
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Use of SiGe bipolar transistors for cryogenic readout of SQUIDs. / Kiviranta, Mikko (Corresponding Author).

In: Superconductor Science and Technology, Vol. 19, No. 12, 2006, p. 1297-1302.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Use of SiGe bipolar transistors for cryogenic readout of SQUIDs

AU - Kiviranta, Mikko

PY - 2006

Y1 - 2006

N2 - We have measured characteristics and noise of four commercially available SiGe heterojunction bipolar transistors at 4.2 K. One device exhibits 75 pV Hz−1/2 white noise and a 1/f noise corner of 20 kHz at 9 mW power dissipation, proving suitable for readout of SQUIDs immersed in liquid He. Another device exhibits 370 pV Hz−1/2 white noise and a 1/f noise corner of 5 kHz at 50 µW dissipation, and still gives useable gain at 7 µW dissipation. This device is useful for SQUID multiplexers intended for closed-cycle refrigerators, in which the cooling power is limited. The achievable dissipation is even compatible for operation in the low-temperature stages of dilution refrigerators or ADRs. Furthermore, SiGe-based dc SQUID readout with 0.35 μΦ0 Hz−1/2 flux noise was demonstrated. Applying negative flux feedback yielded a slew rate exceeding 50Φ0 μs−1.

AB - We have measured characteristics and noise of four commercially available SiGe heterojunction bipolar transistors at 4.2 K. One device exhibits 75 pV Hz−1/2 white noise and a 1/f noise corner of 20 kHz at 9 mW power dissipation, proving suitable for readout of SQUIDs immersed in liquid He. Another device exhibits 370 pV Hz−1/2 white noise and a 1/f noise corner of 5 kHz at 50 µW dissipation, and still gives useable gain at 7 µW dissipation. This device is useful for SQUID multiplexers intended for closed-cycle refrigerators, in which the cooling power is limited. The achievable dissipation is even compatible for operation in the low-temperature stages of dilution refrigerators or ADRs. Furthermore, SiGe-based dc SQUID readout with 0.35 μΦ0 Hz−1/2 flux noise was demonstrated. Applying negative flux feedback yielded a slew rate exceeding 50Φ0 μs−1.

KW - SQUID

KW - multiplexers

KW - bipolar transistors

KW - superconducting transistors

U2 - 10.1088/0953-2048/19/12/014

DO - 10.1088/0953-2048/19/12/014

M3 - Article

VL - 19

SP - 1297

EP - 1302

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

SN - 0953-2048

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ER -