An Ultra-Low-Voltage, 16-Channel Current DAC ASIC in 22nm FDSOI for cryogenic SQUID Biasing

ORAL

Abstract

In this work, we present a sixteen-channel, ultra low-voltage (≤ 0.1 V analog supply) current DAC ASIC designed in 22nm FDSOI technology for biasing SQUIDs. The ASIC integrates eight 6-bit DACs and eight 8-bit DACs, programmed through a simple serial interface. It operates effectively across a wide temperature range, from 300K to 4K, by using the back-gate bias to counteract threshold voltage variations across temperature. The thermometric DACs’ output current range is 0.25 mA and 1.25 mA for the 6-bit and 8-bit DACs, respectively. Measurement results at both cryo and room temperature demonstrate excellent performance, with DNL below 0.5 LSB for the 8-bit DAC and below 0.25 LSB for the 6-bit DAC.

We report on the design and test measurements of ASIC, as well as the status of the integration with Superconducting Low-inductance Undulatory Galvanometers (SLUGs).

*This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.

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Presenters

  • Davide Braga

    • Fermi National Accelerator Laboratory

Authors

  • Davide Braga

    • Fermi National Accelerator Laboratory

  • Suyash P Tripathi

    • Fermi National Accelerator Laboratory
    • University of Toronto

  • Farah Fahim

    • Fermi National Accelerator Laboratory (Fermilab)

  • Manuel B Valentin

    • Northwestern University

  • Paul Rubinov

    • Fermi National Accelerator Laboratory

  • Robert F McDermott

    • University of Wisconsin - Madison
    • Qolab

  • John M Martinis

    • Qolab Inc
    • University of California, Santa Barbara
    • Qolab
    • Qolab, Inc

  • Lou Dal Monte

    • Fermi National Accelerator Laboratory