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Volumn 82, Issue 5, 2010, Pages

Nonwhite frequency noise in spin torque oscillators and its effect on spectral linewidth

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EID: 77957362606     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.82.054416     Document Type: Article
Times cited : (57)

References (32)
  • 11
    • 0018494393 scopus 로고
    • 10.1029/RS014i004p00521
    • P. Lesage and C. Audoin, Radio Sci. 14, 521 (1979). 10.1029/ RS014i004p00521
    • (1979) Radio Sci. , vol.14 , pp. 521
    • Lesage, P.1    Audoin, C.2
  • 12
    • 0000233832 scopus 로고
    • 10.1103/PhysRev.160.290
    • M. Lax, Phys. Rev. 160, 290 (1967). 10.1103/PhysRev.160.290
    • (1967) Phys. Rev. , vol.160 , pp. 290
    • Lax, M.1
  • 13
    • 77957364543 scopus 로고    scopus 로고
    • As is common for real signals (Ref.), we define the PSD over positive frequencies only and normalize so that its integral over these frequencies gives the variance of the signal.
    • As is common for real signals (Ref.), we define the PSD over positive frequencies only and normalize so that its integral over these frequencies gives the variance of the signal.
  • 19
    • 77957331665 scopus 로고    scopus 로고
    • This analysis should not be confused with that done by a DFT spectrum analyzer. We take only the center frequency from each segment, not a complete power spectrum of VIF (t), which is why our result is independent of amplitude fluctuations [ ε (t) in Eq. ]. Amplitude modulation of VIF (t) would create sidebands but would not affect the center frequency of the main peak.
    • This analysis should not be confused with that done by a DFT spectrum analyzer. We take only the center frequency from each segment, not a complete power spectrum of V IF (t), which is why our result is independent of amplitude fluctuations [ε (t) in Eq.]. Amplitude modulation of V IF (t) would create sidebands but would not affect the center frequency of the main peak
  • 20
    • 77957358664 scopus 로고    scopus 로고
    • Comparing the two analysis methods for a variety of experimental conditions and analysis parameters can reveal each method's limitations. As an example, for IF waveforms with the smallest signal-to-noise ratios (smaller than about half that shown in Fig. ), we found that the zero-crossing method gave distorted results while the DFT method remained robust.
    • Comparing the two analysis methods for a variety of experimental conditions and analysis parameters can reveal each method's limitations. As an example, for IF waveforms with the smallest signal-to-noise ratios (smaller than about half that shown in Fig.), we found that the zero-crossing method gave distorted results while the DFT method remained robust.
  • 21
  • 25
    • 77957360872 scopus 로고    scopus 로고
    • In an actual SA, the LO is offset from the center of the frequency bin so that the IF and the bandpass filter are centered around a frequency that is optimal for subsequent signal processing. This is how our SA generates the IF signal centered around 70 MHz that we use for our time-domain measurements.
    • In an actual SA, the LO is offset from the center of the frequency bin so that the IF and the bandpass filter are centered around a frequency that is optimal for subsequent signal processing. This is how our SA generates the IF signal centered around 70 MHz that we use for our time-domain measurements.
  • 26
    • 77957346308 scopus 로고    scopus 로고
    • Actual SAs are carefully designed to yield accurate power values for a variety of detection modes. Since we are interested only in the normalized width and shape of SV (ν), we can ignore many effects that affect the power in all bins equally.
    • Actual SAs are carefully designed to yield accurate power values for a variety of detection modes. Since we are interested only in the normalized width and shape of S V (ν), we can ignore many effects that affect the power in all bins equally


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.