Amplitude and phase noises of a spin-transfer nano-oscillator synchronized by a phase-lock loop

Mitrofanov, Alexander; Сафин, А. Р.; Udalov, N. N.

doi:10.1134/s1063785015080271

Cited by 11 publications

(3 citation statements)

References 9 publications

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“…In [2] considers the case of synchronization of several oscillators in order to reduce PhN. In [3,4] the synchronization scheme of two nanoscale spintronic oscillators was investigated, for which the possibility of PhN reduction in the phase synchronization mode was also demonstrated. Therefore, the mechanism of phase and amplitude noise transformation during synchronization of auto oscillations is of considerable interest from the fundamental point of view for oscillators of different physical nature.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Characteristics of a Biharmonic Oscillator with Two Synchronous Modes

et al. 2022

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The paper investigates the influence of the coupling coefficient of the double-loop filter forming a biharmonic oscillator on the quality factor and resonant impedance of the input impedance at the resonant frequencies of the double-loop filter. The resonant frequencies of the filter are exactly multiples of 2. In this paper show numerical results that simplify the choice of filter parameters to provide conditions for selfexcitation of two oscillations at exactly multiples of frequencies. Two synchronous modes allow to create a generator with compensation for fluctuations in the reactive component of the output impedance of the active element, which increase the phase noise of the oscillator.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Characteristics of a Biharmonic Oscillator with Two Synchronous Modes

et al. 2022

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“…In order to substantially improve the phase and frequency stability, a standard means is the integration of the oscillator into a phase locked loop (PLL) system, which on a circuit level continuously corrects the oscillator's phase fluctuations through comparison with an external reference. This approach applied to STNOs recently gained attention in theory 24,25 as well as in terms of practical realizations 3,4,[26][27][28][29][30] . It represents an important step towards STNO applicability and system integration.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of phase noise in spin torque nano oscillators by a phase locked loop

Wittrock¹,

Kreissig²,

Lacoste³

et al. 2021

Preprint

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The main limitation in order to exploit spin torque nano-oscillators (STNOs) in various potential applications is their large phase noise. In this work, we demonstrate its efficient reduction by a highly reconfigurable, compact, specifically on-chip designed PLL based on custom integrated circuits. First, we thoroughly study the parameter space of the PLL+STNO system experimentally. Second, we present a theory which describes the locking of a STNO to an external signal in a general sense. In our developed theory, we do not restrict ourselves to the case of a perfect phase locking but also consider phase slips and the corresponding low offset frequency 1/f 2 noise, so far the main drawback in such systems. Combining experiment and theory allows us to reveal complex parameter dependences of the system's phase noise. The results provide an important step for the optimization of noise properties and thus leverage the exploitation of STNOs in prospective real applications.

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“…One way to reduce phase noise is to synchronize with an external force or mutually synchronize several oscillators. As an external force, external harmonic influence (EHI) or EHI usually acts in combination with a phase locked loop [12][13][14][15]. The purpose of synchronization is to impose the stability of a reference non-tunable oscillator on a frequency tunable oscillator.…”

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confidence: 99%

Noise Properties of Two Mutually Coupled Spin-Transfer Nanooscillators in the Phase Locking Regime

Mitrofanov

Сафин

Torina

et al. 2020

Izv. vysš. učebn. zaved. Ross., Radioèlektron.

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Introduction. Today, many research endeavors are devoted to the miniaturization of microwave sources. One of the promising approaches is the use of magnetic nanostructures (spintronics elements), providing a wide range of frequency tuning and low power consumption. The main disadvantage of spintronics generators (spintransfer nanoscillators ‒ STNO) is a low output power of generated oscillations (tens of nanowatts and less). A possible solution is to sum up the power of many STNOs in a mutual synchronization mode.Aim. The investigation of noise properties of two connected STNOs with identical and non-identical parameters in a phase synchronization mode.Materials and methods. A model was developed of two STNOs interconnected by spin waves taking into account thermal noises. Spectral power densities of the amplitude and phase noise were obtained by the method of effective linearization.Results. Dependencies were obtained in a general form for attenuation coefficients of the amplitude and phase fluctuations of noise sources for each STNO. Three cases of synchronization were considered: completely identical STNOs, two identical STNOs but with different oscillation frequencies, and two non-identical STNOs, differing in an allowance of self-excitation by frequencies and amplitudes of the oscillations. It was possible to obtain a gain in the amplitude and phase noise for two identical STNOs. In this case, an increase in the allowance of self-excitation led to a decrease in the level of phase and amplitude noise.Conclusion. This analysis of the attenuation coefficients for non-identical STNOs demonstrates the possibility of improving the noise properties of each of the generators. In this case, the best noise value is obtained for an STNO with greater stability in a stand-alone mode.

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Amplitude and phase noises of a spin-transfer nano-oscillator synchronized by a phase-lock loop

Cited by 11 publications

References 9 publications

Analysis of the Characteristics of a Biharmonic Oscillator with Two Synchronous Modes

Analysis of the Characteristics of a Biharmonic Oscillator with Two Synchronous Modes

Stabilization of phase noise in spin torque nano oscillators by a phase locked loop

Noise Properties of Two Mutually Coupled Spin-Transfer Nanooscillators in the Phase Locking Regime

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