DOE OSTI · 1633304
Performance of a low-parasitic frequency-domain multiplexing readout
Abstract
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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Lowitz, A. E., Bender, A. N., Barry, P., 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., Zhang, J.. 2020-04-01. Performance of a low-parasitic frequency-domain multiplexing readout. https://doi.org/10.1007/s10909-020-02384-8
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