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13 December 2020 Performance and characterization of the SPT-3G digital frequency multiplexed readout system using an improved noise and crosstalk model
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Abstract
The third generation South Pole Telescope camera (SPT-3G) improves over its predecessor (SPTpol) by an order of magnitude increase in detector number. The technology used to read out and control these detectors, digital frequency-domain multiplexing (DfMUX), is conceptually the same as used for SPTpol, but extended to accommodate more detectors. A nearly 5x expansion in the readout operating bandwidth has enabled the use of this large focal plane, and SPT-3G performance meets the forecasting targets relevant to its science objectives. However, the electrical dynamics of the higher-bandwidth system depart in significant ways from the characterization and models drawn from the previous generation of cameras. We present an updated derivation for electrical crosstalk in higher-bandwidth DfMUX systems, and identify two previously uncharacterized contributions to readout noise. The updated crosstalk and noise models successfully describe the measured crosstalk and readout noise performance of SPT-3G, and suggest improvements to the readout system for future experiments using DfMUX, such as the LiteBIRD satellite.
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Montgomery, A. J. Anderson, J. S. Avva, A. N. Bender, M. A. Dobbs, D. Dutcher, T. Elleflot, A. Foster, J. C. Groh, W. L. Holzapfel, D. Howe, N. Huang, A. E. Lowitz, G. I. Noble, Z. Pan, A. Rahlin, D. Riebel, G. Smecher, A. Suzuki, and N. Whitehorn "Performance and characterization of the SPT-3G digital frequency multiplexed readout system using an improved noise and crosstalk model", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 114530X (13 December 2020); https://doi.org/10.1117/12.2561537
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