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Phase noise of an HTS resonator operated in the nonlinear regime

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4 Author(s)
Vitusevich, S.A. ; Inst. fur Schicht- und Grenzflachen, Forschungszentrum Julich GmbH, Germany ; Klein, N. ; Zaitsev, A.G. ; Geerk, J.

Nonlinear properties of high-temperature superconducting (HTS) strongly coupled resonators at different input power have been investigated by measurements of the quality factor as a function of input power as well as by generation of the intermodulation distortion (IMD). The double-sided YBCO films on CeO2 buffered sapphire demonstrate advanced performance with the microwave surface resistance of ∼0.3 mΩ at 8.5 GHz at 77 K and an IMD third-order interception point estimated at Pcirc≈70 W. A parallel feedback oscillator was assembled using a transmission type HTS resonator cooled with liquid nitrogen and a room temperature low noise amplifier. Results on the phase noise investigation of the 2.3 GHz oscillator based on HTS resonator operated in the nonlinear regime demonstrated a deviation from the simple model of the phase noise, which predicts an up-conversion of 1/f noise of the amplifier to oscillator phase noise. The latter can be explained by the phase noise introduced additionally due to the nonlinear response of the HTS resonator.

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Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )