Performance and characterization of the SPT-3G digital frequency-domain multiplexed readout system using an improved noise and crosstalk model
Abstract
The third generation South Pole Telescope camera (SPT-3G) improves upon its predecessor (SPTpol) by an order of magnitude increase in detectors on the focal plane. 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 readout differ from predictions based on models of the SPTpol system due to the higher frequencies used, and parasitic impedances associated with new cryogenic electronic architecture. To address this, we present an updated derivation for electrical crosstalk in higher-bandwidth DfMUX systems, and identify two previously uncharacterized contributions to readout noise, which become dominant at high bias frequency. The updated crosstalk and noise models successfully describe the measured crosstalk and readout noise performance of SPT-3G. These results also suggest specific changes to warm electronics component values, wire-harness properties, and SQUID parameters, to improve the readout system for future experiments using DfMUX, such as the LiteBIRD space telescope.
Keywords
Cite
@article{arxiv.2103.16017,
title = {Performance and characterization of the SPT-3G digital frequency-domain multiplexed readout system using an improved noise and crosstalk model},
author = {J. Montgomery and P. A. R. Ade and Z. Ahmed and E. Anderes and A. J. Anderson and M. Archipley and J. S. Avva and K. Aylor and L. Balkenhol and P. S. Barry and R. Basu Thakur and K. Benabed and A. N. Bender and B. A. Benson and F. Bianchini and L. E. Bleem and F. R. Bouchet and L. Bryant and K. Byrum and J. E. Carlstrom and F. W. Carter and T. W. Cecil and C. L. Chang and P. Chaubal and G. Chen and H. -M. Cho and T. -L. Chou and J. -F. Cliche and T. M. Crawford and A. Cukierman and C. Daley and T. de Haan and E. V. Denison and K. Dibert and J. Ding and M. A. Dobbs and D. Dutcher and T. Elleflot and W. Everett and C. Feng and K. R. Ferguson and A. Foster and J. Fu and S. Galli and A. E. Gambrel and R. W. Gardner and N. Goeckner-Wald and J. C. Groh and R. Gualtieri and S. Guns and N. Gupta and R. Guyser and N. W. Halverson and A. H. Harke-Hosemann and N. L. Harrington and J. W. Henning and G. C. Hilton and E. Hivon and W. L. Holzapfel and J. C. Hood and D. Howe and N. Huang and K. D. Irwin and O. B. Jeong and M. Jonas and A. Jones and T. S. Khaire and L. Knox and A. M. Kofman and M. Korman and D. L. Kubik and S. Kuhlmann and C. -L. Kuo and A. T. Lee and E. M. Leitch and A. E. Lowitz and C. Lu and S. S. Meyer and D. Michalik and M. Millea and A. Nadolski and T. Natoli and H. Nguyen and G. I. Noble and V. Novosad and Y. Omori and S. Padin and Z. Pan and P. Paschos and J. Pearson and C. M. Posada and K. Prabhu and W. Quan and A. Rahlin and C. L. Reichardt and D. Riebel and B. Riedel and M. Rouble and J. E. Ruhl and J. T. Sayre and E. Schiappucci and E. Shirokoff and G. Smecher and J. A. Sobrin and A. A. Stark and J. Stephen and K. T. Story and A. Suzuki and K. L. Thompson and B. Thorne and C. Tucker and C. Umilta and L. R. Vale and K. Vanderlinde and J. D. Vieira and G. Wang and N. Whitehorn and W. L. K. Wu and V. Yefremenko and K. W. Yoon and M. R. Young},
journal= {arXiv preprint arXiv:2103.16017},
year = {2022}
}
Comments
Accepted to the Journal of Astronomical Telescopes, Instruments, and Systems