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Advanced Code-Division Multiplexers for Superconducting Detector Arrays



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


Multiplexers based on the modulation of superconducting quantum interference devices are now regularly used in multi-kilopixel arrays of superconducting detectors for astrophysics, cosmology, and materials analysis. Over the next decade, much larger arrays will be needed. These larger arrays require new modulation techniques and multiplexer elements that are compact enough to fit into each pixel. We present a new in-focal-plane code-division multiplexer that provides multiplexing elements with the necessary scalability. This code-division multiplexer uses compact lithographic modulation elements that simultaneously multiplex both signal outputs and superconducting transition-edge sensor (TES) detector bias voltages. It eliminates the shunt resistor used to voltage bias TES detectors, greatly reduces the power dissipation, allows different dc bias voltages for each TES, and makes all elements sufficiently compact to fit inside of the detector pixel area. These in-focal plane code-division multiplexers can be combined with multi-GHz readout based on superconducting microresonators to scale to even larger arrays.
Journal of Low Temperature Physics


superconducting transition-edge sensors, SQUID multiplexers


Irwin, K. , Cho, H. , Doriese, W. , Fowler, J. , Hilton, G. , Niemack, M. , Reintsema, C. , Schmidt, D. , Ullom, J. and Vale, L. (2012), Advanced Code-Division Multiplexers for Superconducting Detector Arrays, Journal of Low Temperature Physics, [online], (Accessed June 25, 2024)


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Created February 11, 2012, Updated November 10, 2018