Code-division SQUID multiplexing

Niemack, M. D.; Beyer, J.; Cho, H. M.; Doriese, W. B.; Hilton, G. C.; Irwin, K. D.; Reintsema, C. D.; Schmidt, D. R.; Ullom, J. N.; Vale, L. R.
April 2010
Applied Physics Letters;4/19/2010, Vol. 96 Issue 16, p163509
Academic Journal
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.


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