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1 GHz Waveform Synthesis With Josephson Junction Arrays.

Christine A Donnelly1,2, Nathan E Flowers-Jacobs1, Justus A Brevik1

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IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee
|November 20, 2024
PubMed
Summary
This summary is machine-generated.

Researchers synthesized gigahertz frequency waveforms using Josephson junctions, demonstrating quantum-locked operation. This advancement paves the way for precise radio frequency (RF) reference sources.

Keywords:
Digital–analog conversionJosephson junction (JJ) arrayspower measurementquantizationsignal synthesissuperconducting devicessuperconducting integrated circuits

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Area of Science:

  • Quantum electronics
  • High-frequency signal generation

Background:

  • Josephson junctions offer a quantum-based method for precise signal synthesis.
  • Existing methods for gigahertz waveform generation face limitations in spectral purity and power control.

Purpose of the Study:

  • To synthesize single- and multiple-tone gigahertz waveforms using Josephson junction arrays.
  • To demonstrate quantum-locked operation and spectrally selective programmability.
  • To advance the development of a Josephson Arbitrary Waveform Synthesizer (JAWS)-based primary RF reference source.

Main Methods:

  • Utilized lumped-element circuits for initial waveform synthesis (1-2 GHz).
  • Introduced a narrow-band diplexer circuit for enhanced power and spectral purity.
  • Synthesized single-tone and multisine waveforms with controlled power and phase.

Main Results:

  • Achieved -71 dBm output power and -66 dBc spurious-free dynamic range (SFDR) for single-tone waveforms.
  • With a diplexer, synthesized a 1 GHz sinusoid at -49 dBm with -79 dBc in-band SFDR.
  • Demonstrated spectrally selective power and phase programmability using multisine waveforms.

Conclusions:

  • The quantized pulse-based synthesis technique is not the limiting factor for spectral purity.
  • Room-temperature electronics currently limit spectral purity, indicating areas for future circuit design improvements.
  • Significant progress has been made towards a JAWS-based primary RF reference source for programmable, quantum-referenced, low-distortion gigahertz signals.