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

    @article{d81ee44f93fa4b67ba8f3d828799b5e7,
    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}",
    year = "2006",
    doi = "10.1088/0953-2048/19/5/S43",
    language = "English",
    volume = "19",
    pages = "S371--S375",
    journal = "Superconductor Science and Technology",
    issn = "0953-2048",
    publisher = "Institute of Physics IOP",
    number = "5",

    }

    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 -