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Superconductor Science and Technology

Published

Author(s)

Kent D. Irwin, Michael D. Niemack, Joern Beyer, Hsiao-Mei Cho, William B. Doriese, Gene C. Hilton, Carl D. Reintsema, Daniel R. Schmidt, Joel N. Ullom, Leila R. Vale

Abstract

Multiplexed superconducting quantum interference device (SQUID) amplifiers have recently enabled the deployment of kilopixel arrays of superconducting transition-edge sensor (TES) detectors on a variety of receivers for astrophysics. Existing multiplexing techniques for TES arrays, however, have constraints due to aliasing of SQUID noise, the size of the required filtering elements, or the complexity of the room-temperature electronics that make it difficult to scale to much larger arrays. We have developed a Walsh code-division SQUID multiplexer that has the potential to enable the multiplexing of larger arrays or pixels with faster thermal response times. The multiplexer uses superconducting switches to modulate the polarity of coupling between N individual TES detectors and a single output SQUID channel. The polarities of the detector signals are switched in the pattern of an N N Walsh matrix, so that a frame composed of N orthogonal samples can be used to reconstruct the detector signals without degradation. We present an analysis of the circuit architecture and preliminary results.
Citation
Superconductor Science & Technology
Volume
23

Keywords

SQUID, multiplexer, Walsh code

Citation

Irwin, K. , Niemack, M. , Beyer, J. , Cho, H. , Doriese, W. , Hilton, G. , Reintsema, C. , Schmidt, D. , Ullom, J. and Vale, L. (2010), Superconductor Science and Technology, Superconductor Science & Technology, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903896 (Accessed June 18, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created February 22, 2010, Updated February 19, 2017