KIT | KIT-Bibliothek | Impressum | Datenschutz

Online Demodulation and Trigger for Flux-ramp Modulated SQUID Signals

Karcher, N. 1; Muscheid, T. ORCID iD icon 1; Wolber, T. 1; Richter, D.; Enss, C.; Kempf, S. 2; Sander, O. 1
1 Institut für Prozessdatenverarbeitung und Elektronik (IPE), Karlsruher Institut für Technologie (KIT)
2 Institut für Mikro- und Nanoelektronische Systeme (IMS), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Due to the periodic characteristics of SQUIDs, a suitable linearization technique is required for SQUID-based readout. Flux-ramp modulation is a common linearization technique and is typically applied for the readout of a microwave SQUID multiplexer as well as since recently also for dc-SQUIDs. Flux-ramp modulation requires another stage in the signal processing chain to demodulate the SQUID output signal before further processing. For cryogenic microcalorimeters, the signal contains events that are given by a fast exponentially rising and slowly exponentially decaying pulses shape. The events shall be detected by a trigger engine and recorded by a storage logic. Since the data rate can be decreased significantly by demodulation and event detection, it is desirable to do both steps on the deployed fast FPGA logic during measurement before passing the data to a general-purpose processor. In this contribution, we show the implementation of efficient multi-channel flux-ramp demodulation computed at run-time on a SoC-FPGA. Furthermore, a concept and implementation for an online trigger and buffer mechanism with its theoretical trigger loss rates depending on buffer size is presented. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000151328
Veröffentlicht am 10.10.2022
Originalveröffentlichung
DOI: 10.1007/s10909-022-02858-x
Scopus
Zitationen: 4
Web of Science
Zitationen: 4
Dimensions
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikro- und Nanoelektronische Systeme (IMS)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 0022-2291, 1573-7357
KITopen-ID: 1000151328
HGF-Programm 54.12.02 (POF IV, LK 01) System Technologies
Erschienen in Journal of Low Temperature Physics
Verlag Springer
Band 209
Seiten 581–588
Vorab online veröffentlicht am 26.09.2022
Schlagwörter Event trigger; Flux-ramp modulation; Frequency-division multiplexing; Magnetic microcalorimeters; Microwave SQUID multiplexer; Software-defined radio
Nachgewiesen in Web of Science
Dimensions
Scopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page