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Linearized superconducting quantum interference device array for high bandwidth frequency-domain readout

T Lanting1, M Dobbs, H Spieler

  • 1Department of Physics, McGill University, Montreal H2T 2Y8, Canada. tlanting@dwavesys.com

The Review of Scientific Instruments
|October 2, 2009
PubMed
Summary
This summary is machine-generated.

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We developed a linearized superconducting quantum interference device (SQUID) array with cryogenic feedback. This design offers improved bandwidth and linearity for sensitive detector readouts.

Area of Science:

  • Superconducting quantum devices
  • Cryogenic instrumentation
  • Sensor technology

Background:

  • Superconducting Quantum Interference Devices (SQUIDs) are sensitive magnetometers.
  • Traditional SQUID readout systems often face limitations in bandwidth and linearity.
  • Transition-edge sensor (TES) bolometers require high-performance readout electronics.

Purpose of the Study:

  • To design and demonstrate a linearized SQUID array (LISA) with cryogenic feedback.
  • To improve the flux-locked loop bandwidth and linearity of SQUID systems.
  • To enable multiplexed readout for transition-edge sensor bolometers.

Main Methods:

  • Constructed a 300-element series array SQUID from three monolithic 100-element arrays.
  • Implemented a cryogenic feedback loop using a feedback resistor.

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  • Utilized a short feedback path to enhance loop gain and bandwidth.

    • Main Results:

    • Achieved a substantially larger flux-locked loop bandwidth compared to room-temperature amplified SQUID systems.
    • Demonstrated sufficient linearity, noise performance, and dynamic range (3 Phi(0)) for target applications.
    • Successfully linearized the SQUID array using cryogenic feedback.

    Conclusions:

    • The linearized SQUID array (LISA) is a viable technology for advanced sensor readout.
    • The cryogenic feedback approach overcomes limitations of traditional SQUID amplifiers.
    • LISA performance metrics are suitable for multiplexed readout of transition-edge sensor bolometers.