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Frequency-domain readout multiplexing of transition-edge sensor arrays

✍ Scribed by T.M. Lanting; K. Arnold; Hsiao-Mei Cho; John Clarke; Matt Dobbs; William Holzapfel; Adrian T. Lee; M. Lueker; P.L. Richards; A.D. Smith; H.G. Spieler

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
157 KB
Volume
559
Category
Article
ISSN
0168-9002

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✦ Synopsis

We have demonstrated frequency-domain readout multiplexing of eight channels for superconducting transition-edge sensor bolometer arrays. The multiplexed readout noise is 6.5 pA/OHz, well below the bolometer dark noise of 15-20 pA/OHz. We measure an upper limit on crosstalk of 0.004 between channels adjacent in frequency which meets our design requirement of 0.01. We have observed vibration insensitivity in our frequency-domain multiplexed transition-edge sensors, making this system very attractive for telescope and satellite observations. We also discuss extensions to our multiplexed readout. In particular, we are developing a SQUID flux-locked loop that is entirely cold and collaborating on digital multiplexer technology in order to scale up the number of multiplexed channels.

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