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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Ultra-low noise, bi-polar, programmable current sources.

M S Mrozowski1, I C Chalmers1, S J Ingleby1

  • 1Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom.

The Review of Scientific Instruments
|February 1, 2023
PubMed
Summary
This summary is machine-generated.

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We developed open-source, ultra-low noise programmable current sources for Optically Pumped Magnetometers (OPMs). These versatile devices offer high precision and low noise, suitable for various scientific applications requiring precise current control.

Area of Science:

  • Instrumentation and Measurement
  • Applied Physics
  • Electronics Engineering

Background:

  • Optically Pumped Magnetometers (OPMs) require highly stable and low-noise current sources for optimal performance.
  • Existing current source solutions may lack the necessary precision, programmability, or open-source accessibility for advanced research.

Purpose of the Study:

  • To design and implement fully open-source, ultra-low noise programmable current source systems.
  • To create versatile current drivers suitable for OPMs and other sensitive applications.
  • To achieve high-resolution, bi-directional current control with minimal noise.

Main Methods:

  • Development of two distinct configurations of programmable current source systems.
  • Implementation of 16-bit resolution for precise current control.

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  • Characterization of noise performance, including 1/f noise bandwidth and amplitude.

    • Main Results:

    • The systems provide bi-directional current ranges of ±10 mA and ±250 mA across three independent channels.
    • Achieved a narrow 1/f noise bandwidth of 1 Hz, crucial for magnetic field manipulation.
    • Demonstrated ultra-low noise levels of 146 pA/√Hz and 4.1 nA/√Hz, translating to 15 and 16 ppb/Hz relative to full scale.

    Conclusions:

    • The developed open-source current sources meet the stringent requirements for high-performance OPMs.
    • The systems' specifications indicate broad applicability in various scientific fields needing precise current control.
    • The open-source nature facilitates accessibility and further development within the research community.