A post-SQUID ac amplifier aimed for multiplexed detector readouts

Mikko Kiviranta, Antti Virtanen, Heikki Seppä, Jari Penttilä, Juha Hassel, Panu Helistö

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

We have built a room temperature amplifier based on Si JFETs (junction field effect transistors) intended for ac-coupled SQUID (superconducting quantum interference device) readouts, such as in frequency-domain multiplexed transition-edge sensor systems. The amplifier operates at 5 MHz centre frequency where it has the measured noise temperature of 27 K for a 60 Ω load, which includes the noise from the active termination and the room temperature transformer. When it was driven from a SQUID with an on-chip matching transformer, flux noise of 0.45 μΦ0 Hz−1/2 was obtained. Additionally, we consider the potential of the recently introduced SiGe bipolar transistors for the same application. The dynamic range considerations for SQUID multiplexers, which require the use of an amplifier with a low noise temperature, are briefly discussed.
Original languageEnglish
Pages (from-to)S371-S375
Number of pages5
JournalSuperconductor Science and Technology
Volume19
Issue number5
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

SQUIDs
readout
noise temperature
amplifiers
Detectors
interference
transformers
detectors
JFET
room temperature
bipolar transistors
multiplexing
Temperature
low noise
dynamic range
Bipolar transistors
Field effect transistors
chips
sensors
Fluxes

Keywords

  • transition edge sensors
  • calorimeters
  • SQUID
  • superconducting microwave devices
  • superconducting transistors
  • bipolar transistors
  • amplifiers

Cite this

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title = "A post-SQUID ac amplifier aimed for multiplexed detector readouts",
abstract = "We have built a room temperature amplifier based on Si JFETs (junction field effect transistors) intended for ac-coupled SQUID (superconducting quantum interference device) readouts, such as in frequency-domain multiplexed transition-edge sensor systems. The amplifier operates at 5 MHz centre frequency where it has the measured noise temperature of 27 K for a 60 Ω load, which includes the noise from the active termination and the room temperature transformer. When it was driven from a SQUID with an on-chip matching transformer, flux noise of 0.45 μΦ0 Hz−1/2 was obtained. Additionally, we consider the potential of the recently introduced SiGe bipolar transistors for the same application. The dynamic range considerations for SQUID multiplexers, which require the use of an amplifier with a low noise temperature, are briefly discussed.",
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author = "Mikko Kiviranta and Antti Virtanen and Heikki Sepp{\"a} and Jari Penttil{\"a} and Juha Hassel and Panu Helist{\"o}",
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A post-SQUID ac amplifier aimed for multiplexed detector readouts. / Kiviranta, Mikko; Virtanen, Antti; Seppä, Heikki; Penttilä, Jari; Hassel, Juha; Helistö, Panu.

In: Superconductor Science and Technology, Vol. 19, No. 5, 2006, p. S371-S375.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A post-SQUID ac amplifier aimed for multiplexed detector readouts

AU - Kiviranta, Mikko

AU - Virtanen, Antti

AU - Seppä, Heikki

AU - Penttilä, Jari

AU - Hassel, Juha

AU - Helistö, Panu

PY - 2006

Y1 - 2006

N2 - We have built a room temperature amplifier based on Si JFETs (junction field effect transistors) intended for ac-coupled SQUID (superconducting quantum interference device) readouts, such as in frequency-domain multiplexed transition-edge sensor systems. The amplifier operates at 5 MHz centre frequency where it has the measured noise temperature of 27 K for a 60 Ω load, which includes the noise from the active termination and the room temperature transformer. When it was driven from a SQUID with an on-chip matching transformer, flux noise of 0.45 μΦ0 Hz−1/2 was obtained. Additionally, we consider the potential of the recently introduced SiGe bipolar transistors for the same application. The dynamic range considerations for SQUID multiplexers, which require the use of an amplifier with a low noise temperature, are briefly discussed.

AB - We have built a room temperature amplifier based on Si JFETs (junction field effect transistors) intended for ac-coupled SQUID (superconducting quantum interference device) readouts, such as in frequency-domain multiplexed transition-edge sensor systems. The amplifier operates at 5 MHz centre frequency where it has the measured noise temperature of 27 K for a 60 Ω load, which includes the noise from the active termination and the room temperature transformer. When it was driven from a SQUID with an on-chip matching transformer, flux noise of 0.45 μΦ0 Hz−1/2 was obtained. Additionally, we consider the potential of the recently introduced SiGe bipolar transistors for the same application. The dynamic range considerations for SQUID multiplexers, which require the use of an amplifier with a low noise temperature, are briefly discussed.

KW - transition edge sensors

KW - calorimeters

KW - SQUID

KW - superconducting microwave devices

KW - superconducting transistors

KW - bipolar transistors

KW - amplifiers

U2 - 10.1088/0953-2048/19/5/S43

DO - 10.1088/0953-2048/19/5/S43

M3 - Article

VL - 19

SP - S371-S375

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

SN - 0953-2048

IS - 5

ER -