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Dynamic characteristics of S-band DC SQUID amplifier

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5 Author(s)
Prokopenko, G.V. ; Inst. of Radio Eng. & Electron., Russian Acad. of Sci., Moscow, Russia ; Shitov, S.V. ; Lapitskaya, I.L. ; Koshelets, V.P.
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A low-noise RF amplifier based on a dc SQUID (SQA) has been tested in the frequency range 3.0-4.6 GHz in the open-loop configuration. The following parameters have been measured for the single-stage balanced type SQA at 4.0 GHz: gain (12±1) dB, 3 dB bandwidth of 500 MHz and noise temperature (1.0±0.25) K. For the nonbalanced type SQA at 4.0 GHz gain was (15±1) dB, 3 dB bandwidth 200 MHz and noise temperature (0.5±0.25) K. The improved performance is obtained due to the increased characteristic voltage (≈420 μV) of the small-area (down to 0.7-0.9 μm2) high-quality Nb-AlOx-Nb SIS junctions. The saturation power (normalized to 1 GHz) referred to the input at 1 dB gain compression is estimated as ≈55 K*GHz at a bias voltage of 60 μV. The reasons for saturation of the SQA are discussed.

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