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Frequency-domain multiplexed readout of transition-edge sensor arrays with a superconducting quantum interference device

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10 Author(s)
Lanting, T.M. ; Physics Department, University of California, Berkeley, California 94720 ; Hsiao-Mei Cho ; Clarke, John ; Holzapfel, W.L.
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We demonstrate an eight-channel frequency-domain readout multiplexer for superconducting transition-edge sensors (TESs). Each sensor is biased with a sinusoidal voltage at a unique frequency. The sensor currents are summed and measured with a single superconducting quantum interference device (SQUID) array. The 100-element SQUID array is operated with shunt feedback electronics that have a slew rate of 1.2×107 Φ0/s at 1 MHz. The multiplexer readout noise is

6.5 pA/
 Hz
, which is well below the expected sensor noise of
15 pA/
 Hz
. We measure an upper limit on adjacent channel crosstalk of 0.004, which meets our design requirements. The demodulated noise spectra of multiplexed TESs are white at frequencies down to 200 mHz.

Published in:

Applied Physics Letters  (Volume:86 ,  Issue: 11 )