Code-division SQUID multiplexing

Published

April 23, 2010

Author(s)

Michael D. Niemack, Kent D. Irwin, 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) readout systems are a critical technology for measuring large arrays of superconducting transition-edge sensor (TES) detectors. Current successful SQUID multiplexing architectures are modulated in time and frequency. We present a SQUID multiplexing architecture that is modulated by Walsh codes and will enable scaling to much larger TES arrays. Measurements and simulations of a prototype four channel code-division multiplexer show that this modulation scheme enables precise timing resolution of incident pulses for microcalorimeter applications, is not degraded by SQUID noise aliasing, suppresses noise pickup in the readout circuit and has low-levels of crosstalk between channels. Furthermore, the modulation of the signal before it couples to the SQUID suppresses 1/f noise to below 20 mHz, suggesting the use of this circuit for 1/f mitigation in more general SQUID readout applications.

Citation

Applied Physics Letters

Volume

96

Issue

16

Pub Type

Journals

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Keywords

SQUID measurement, transition-edge sensor, detector array, noise mitigation

Citation

Niemack, M. , Irwin, K. , Beyer, J. , Cho, H. , Doriese, W. , Hilton, G. , Reintsema, C. , Schmidt, D. , Ullom, J. and Vale, L. (2010), Code-division SQUID multiplexing, Applied Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904603 (Accessed February 12, 2025)