Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 1297-1302 |
| Number of pages | 6 |
| Journal | Superconductor Science and Technology |
| Volume | 19 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2006 |
| MoE publication type | A1 Journal article-refereed |
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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 journal › Article › Scientific › peer-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
IS - 12
ER -