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Stochastic-parametric amplification of narrow-band signals in a single-junction SQUID interferometer
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10.1063/1.2832354
/content/aip/journal/ltp/34/1/10.1063/1.2832354
http://aip.metastore.ingenta.com/content/aip/journal/ltp/34/1/10.1063/1.2832354
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Potential energy of a single-junction interferometer as a function of the normalized magnetic flux for ; the parameter . The inset shows the same for .

Image of FIG. 2.
FIG. 2.

Stochastic resonance: gain of the magnetic field in the interferometer as a function of the noise level with a frequency band bounded above by the cutoff frequency [Hz]: 128 (1), 512 (2), 2048 (3), 4096 (4) for , .

Image of FIG. 3.
FIG. 3.

Gain of the magnetic flux in the interferometer as a function of the amplitude of the high-frequency field for different values of the thermal noise : 0 (1), 0.025 (2), 0.05 (3), 0.075 (4) for , , , , .

Image of FIG. 4.
FIG. 4.

Maximum parametric gain of the interferometer as a function of the ratio of the pump frequency to the information signal frequency at , .

Image of FIG. 5.
FIG. 5.

Fourier amplitude spectrum of the output signal under the joint influence of noise and a high-frequency pump signal. The spectrum is calculated at the point of maximum stochastic-parametric amplification at a fixed noise level, for , , , , , .

Image of FIG. 6.
FIG. 6.

Frequency dependence of the stochastic-parametric gain of the magnetic flux in an interferometer for different values of the ratio of the noise and high-frequency pump: (1), (2), (3), (4), for , . Each curve is calculated at a fixed noise level.

Image of FIG. 7.
FIG. 7.

Dependence of the amplitude of the fundamental harmonic of the high-frequency amplified signal on the amplitude of the input low-frequency information signal (transfer characteristics of the interferometer) for different shapes of the high-frequency pump signal: meander (1), thermal noise (2), sine (3) for , , .

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/content/aip/journal/ltp/34/1/10.1063/1.2832354
2008-01-01
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stochastic-parametric amplification of narrow-band signals in a single-junction SQUID interferometer
http://aip.metastore.ingenta.com/content/aip/journal/ltp/34/1/10.1063/1.2832354
10.1063/1.2832354
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