Performance of an x-ray microcalorimeter under ac biasing

Jan van der Kuur, Piet de Korte, Mikko Kiviranta, Heikki Seppä

    Research output: Contribution to journalArticleScientificpeer-review

    18 Citations (Scopus)

    Abstract

    Frequency domain multiplexing (FDM) is an attractive option for the readout of imaging arrays of microcalorimeters.
    Implementation of FDM requires ac biasing of the individual microcalorimeters. In this letter we present a small signal model for the behavior of a microcalorimeter under ac bias.
    Moreover, we have measured the behavior of the same microcalorimeter under ac (at 46 kHz) and dc bias. These experiments show that the performance of the device is very similar in terms of energy resolution, pulse shapes, and current–voltage characteristics.
    The measured energy resolution at 5.89 keV is 6.9 eV for ac bias and 5.5 eV for dc bias.
    The effective time constant in both cases is 100 μs.
    Original languageEnglish
    Pages (from-to)4467-4469
    JournalApplied Physics Letters
    Volume81
    Issue number23
    DOIs
    Publication statusPublished - 2002
    MoE publication typeA1 Journal article-refereed

    Keywords

    • calorimeters
    • x-ray detection
    • x-ray spectroscopy
    • readout electronics
    • image sensors
    • frequency division multiplexing

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