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Code-division SQUID multiplexing
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DOI：10.1063/1.3378772.png)
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Multiplexed superconducting quantum interference device (SQUID) readout systems are critical for measuring large arrays of superconducting transition-edge sensors (TES). We demonstrate a code-division SQUID multiplexing (CDM) architecture that is modulated by Walsh codes. Measurements and simulations of a prototype multiplexer show that this modulation scheme is not degraded by SQUID-noise aliasing, suppresses parasitic pickup, and has low levels of crosstalk. These properties enable this architecture to scale to large TES arrays. Furthermore, CDM modulation suppresses the 1/f knee in the noise to below 20 mHz, suggesting the use of this circuit for low-frequency-noise mitigation in more general SQUID applications. (C) 2010 American Institute of Physics. [doi:10.1063/1.3378772]
Keyword:
ARRAYS
SENSORS
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10.4W
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17.8W
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Single superconducting quantum interference device multiplexer for arrays of low-temperature sensors
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