Performance of a Low-Parasitic Frequency-Domain Multiplexing Readout


Frequency-domain multiplexing is a readout technique for transition-edge sensor bolometer arrays used on modern cosmic microwave background experiments, including the SPT-3G receiver. Here, we present design details and performance measurements for a low-parasitic frequency-domain multiplexing readout. Reducing the parasitic impedance of the connections between cryogenic components provides a path to improve both the crosstalk and noise performance of the readout. Reduced crosstalk will in turn allow higher-multiplexing factors. We have demonstrated a factor of two improvement in parasitic resistance compared to SPT-3G hardware. Reduced parasitics also permits operation of lower-resistance bolometers optimized for improved readout noise performance. We demonstrate that a module in the prototype system has comparable readout noise performance to an SPT-3G module when operated with dark TES bolometers in the laboratory.

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Work at the University of Chicago is supported by the National Science Foundation through Grant PLR-1248097. Work at Argonne National Laboratory is supported by UChicago Argonne LLC, Operator of Argonne National Laboratory (Argonne). Argonne, a U.S. Department of Energy Office of Science Laboratory, is operated under Contract No. DE-AC02-06CH11357. The McGill authors acknowledge funding from the Natural Sciences and Engineering Research Council of Canada, Canadian Institute for Advanced Research, and the Fonds de recherche du Québec Nature et technologies.

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Lowitz, A.E., Bender, A.N., Barry, P. et al. Performance of a Low-Parasitic Frequency-Domain Multiplexing Readout. J Low Temp Phys 199, 192–199 (2020).

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  • Frequency-domain multiplexing
  • Transition-edge sensors
  • Cosmic microwave background