A post-SQUID ac amplifier aimed for multiplexed detector readouts

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

doi:10.1088/0953-2048/19/5/S43

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 journal › Article › Scientific › peer-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 language	English
Pages (from-to)	S371-S375
Number of pages	5
Journal	Superconductor Science and Technology
Volume	19
Issue number	5
DOIs	https://doi.org/10.1088/0953-2048/19/5/S43
Publication status	Published - 2006
MoE publication type	A1 Journal article-refereed

Keywords

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

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10.1088/0953-2048/19/5/S43

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.",

keywords = "transition edge sensors, calorimeters, SQUID, superconducting microwave devices, superconducting transistors, bipolar transistors, amplifiers",

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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doi = "10.1088/0953-2048/19/5/S43",

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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

SN - 0953-2048

VL - 19

SP - S371-S375

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

IS - 5

ER -

A post-SQUID ac amplifier aimed for multiplexed detector readouts

Abstract

Keywords

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