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Mun Kim, Chunlei Zhang, Chenyang Lu, Jacob Burgess, and Can-Ming Hu†. 2025: A two-stage injection locking amplifier based on a cavity magnonic oscillator, Chinese Physics B, 34(6): 067104. doi: 10.1088/1674-1056/add1bf
Citation: Mun Kim, Chunlei Zhang, Chenyang Lu, Jacob Burgess, and Can-Ming Hu†. 2025: A two-stage injection locking amplifier based on a cavity magnonic oscillator, Chinese Physics B, 34(6): 067104. doi: 10.1088/1674-1056/add1bf
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A two-stage injection locking amplifier based on a cavity magnonic oscillator

  • Department of Physics and Astronomy, University of Manitoba, Winnipeg, CA, R3T 2M5, Canada

  • Received Date: 27/03/2025
    Accepted Date: 27/04/2025
  • Fund Project:

    This work has been funded by NSERC Discovery Grants, NSERC Discovery Accelerator Supplements, Innovation Proof-of-Concept Grant of Research Manitoba, and Faculty of Science Research Innovation and Commercialization Grant of University of Manitoba (C.-M.H.).

  • PACS: 71.36.+c; 84.30.Le; 84.40.Dc; 42.82.Fv

  • A cavity magnonic oscillator uses the coupling of a planar transmission line oscillator (cavity) and spin excitations (magnons) in a ferrimagnetic material to achieve superior frequency stability and reduced phase noise. Like many low phase noise oscillators, a cavity magnonic oscillator faces the challenge that its narrow resonance profile is not well suited for injection locking amplification. This work presents an improved design for such an oscillator configured as an injection locking amplifier (ILA) with an extended lock range. The proposed design features a two-stage architecture, consisting of a pre-amplification oscillator and a cavity magnonic oscillator, separated by an isolator to prevent backward locking. By optimizing the circuit parameters of each stage, the proposed design achieved an order of magnitude increase in lock range, when compared to its predecessors, all while preserving the phase noise quality of the input, making it well-suited for narrowband, sensitive signal amplification. Furthermore, this work provides a method for using oscillators with high spectral purity as injection locking amplifiers.
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A two-stage injection locking amplifier based on a cavity magnonic oscillator

  • Received Date: 27/03/2025
  • Accepted Date: 27/04/2025
Fund Project: 

Abstract: A cavity magnonic oscillator uses the coupling of a planar transmission line oscillator (cavity) and spin excitations (magnons) in a ferrimagnetic material to achieve superior frequency stability and reduced phase noise. Like many low phase noise oscillators, a cavity magnonic oscillator faces the challenge that its narrow resonance profile is not well suited for injection locking amplification. This work presents an improved design for such an oscillator configured as an injection locking amplifier (ILA) with an extended lock range. The proposed design features a two-stage architecture, consisting of a pre-amplification oscillator and a cavity magnonic oscillator, separated by an isolator to prevent backward locking. By optimizing the circuit parameters of each stage, the proposed design achieved an order of magnitude increase in lock range, when compared to its predecessors, all while preserving the phase noise quality of the input, making it well-suited for narrowband, sensitive signal amplification. Furthermore, this work provides a method for using oscillators with high spectral purity as injection locking amplifiers.

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