SQUID-based Multiplexing by Slope Switching
and Binary-to-Hadamard Address Translation

Mikko Kiviranta and Nikolai Beev

Abstract - We have demonstrated multiplexing and demultiplexing of seven test signals using the Hadamard basis set. The encoding utilizes the sign change of the SQUID gain when a Φ₀/2 flux shift occurs. The periodicity of the SQUID response allows recursive construction of in principle arbitrarily high order Hadamard matrices out of binary addresses and hence makes possible to access N channels by log2 N address lines.

Index Terms - Code division multiplexing, SQUIDs, Superconducting photodetectors.

IEEE/CSC & ESAS European Superconductivity News Forum (ESNF) No. 22 October/November 2012.  ESNF Reference No. ST319; Category 4
The published version of this preprint appeared in IEEE Transactions on Applied Superconductivity 23, 2500604 (June 2013).