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De Gruyter eBooks

X-BAND PARAMETRIC AMPLIFIER AND MICROWAVE SQUID USING SINGLETUNNEL- JUNCTION SUPERCONDUCTING INTERFEROMETER

L. S. Kuzmin, K. K. Likharev, V. V. Migulin, E.A. Polunin, N.A. Simonov

Published Dec 31, 1986• 7 citations
Publisher

Abstract

X-BAND PARAMETRIC AMPLIFIER AND MICROWAVE SQUID USING SINGLETUNNEL- JUNCTION SUPERCONDUCTING INTERFEROMETER was published in SQUID '85 Superconducting Quantum Interference Devices and their Applications on page 1029.
DOI
10.1515/9783110862393.1029

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Demonstration of SQUID (Superconducting Quantum Interference Device) parametric amplifier. Interim report 1 Oct 83-15 Mar 84

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De Gruyter eBooks•Dec 31, 1980•0 citations
TRW has been developing low noise microwave parametric amplifier with Josephson junction SQUIDs (Superconducting Quantum Interference Devices). This report summarizes the second phase of the program which includes measurement of the amplifier performance at X-band, and design and fabrication of a SQUID array amplifier. We have demonstrated gain in excess of 10 dB at 8.4 GHz and a measured noise temperature equal to 6K with an uncertainty of (+15/-7)K. Arrays with both 25 and 50 elements and 50 ohmi impedance have been designed and fabricated. These arrays should increase the dynamic range of the amplifier.
This is the first Annual Report of an effort to demonstrate a low noise superconducting microwave amplifier. The amplifier is a nearly degenerate, single idler parametric amplifier which uses the nonlinear inductance of a single junction SQUID (Superconducting Quantum Interference Device). The design frequency is 9 GHz, 10 dB gain, and 16% bandwidth. In order to maximize the saturation power, the device impedance was chosen near 1ohm and a matching network was designed to transform to 50ohm. In later designs, a coherent array of SQUIDs is expected to increase the power and impedance. This report includes the design and test of the 50ohm to 1ohm broadband transformer, design and fabrication of the SQUID amplifier, and both saturation and noise analyses of the single SQUID and SQUID array. The analytical results, reported to the 1982 Applied Superconductivity Conference are: the noise temperature of the single SQUID parametric amplifier is equal to the amplifier termination temperature T(o), the response is linear to several percent of the flux quantum energy in the SQUID: the amplifier will be saturated by broad band noise if the noise source temperature is much greater than 10 To; and the array parametric amplifier has the same noise temperature as the single device indicating an N-fold increase in dynamic range. (Author)