A two-stage injection locking amplifier based on a cavity magnonic oscillator

doi:10.1088/1674-1056/add1bf

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.

Keywords: cavity magnonic oscillator injection locking amplifier

Received: 27 March 2025
Revised: 27 April 2025
Accepted manuscript online: 29 April 2025

PACS:	71.36.+c	(Polaritons (including photon-phonon and photon-magnon interactions))
	84.30.Le	(Amplifiers)
	84.40.Dc	(Microwave circuits)
	42.82.Fv	(Hybrid systems)

Fund: 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.).

Corresponding Authors: Can-Ming Hu
E-mail: can-ming.hu@umanitoba.ca

Cite this article:

Mun Kim, Chunlei Zhang, Chenyang Lu, Jacob Burgess, and Can-Ming Hu A two-stage injection locking amplifier based on a cavity magnonic oscillator 2025 Chin. Phys. B 34 067104

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A two-stage injection locking amplifier based on a cavity magnonic oscillator

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