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Performance of a low-parasitic frequency-domain multiplexing readout

Lowitz, A. E., Bender, A. N., Barry, Peter, Cecil, T. W., Chang, C. L., Divan, R., Dobbs, M. A., Gilbert, A. J., Kuhlmann, S. E., Lisovenko, M., Montgomery, J., Novosad, V., Padin, S., Pearson, J. E., Wang, G., Yefremenko, V. and Zhang, J. 2020. Performance of a low-parasitic frequency-domain multiplexing readout. Journal of Low Temperature Physics 199 (1-2) , pp. 192-199. 10.1007/s10909-020-02384-8

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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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: Springer
ISSN: 0022-2291
Date of Acceptance: 2 February 2020
Last Modified: 01 Feb 2023 14:15

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