Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Code-division SQUID multiplexing

Published

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

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 March 1, 2024)
Created April 23, 2010, Updated February 19, 2017