Two-stage locally linearized SQUID readout for frequency domain multiplexed calorimeter arrays

  title={Two-stage locally linearized SQUID readout for frequency domain multiplexed calorimeter arrays},
  author={Mikko Kiviranta and Leif Gr{\"o}nberg and Hannu Sipola},
  journal={Superconductor Science and Technology},
We have constructed a two-stage SQUID amplifier intended for multiplexed cryogenic detector arrays. The upper SQUID is a locally linearized 6 × 80 array showing 0.13 μΦ0 Hz − 1/2 flux noise at 4.2 K. The lower linearized 4 × 3 SQUID array has decoupled input and feedback coils and shows 0.28 μΦ0 Hz − 1/2 flux noise at 4.2 K. Design principles and measured performance are reviewed. 

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