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Monolithic high-temperature superconducting heterodyne Josephson frequency down-converter
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Photographs of the packaged monolithic HTS down-converter and (b) enlarged area of the heterodyne oscillator-mixer where two Josephson junctions are shunted by a Au thin-film resistor (the inset is a SEM micrograph of the YBCO step-edge junction on MgO substrate).

Image of FIG. 2.
FIG. 2.

Schematic diagram of the HTS MMIC frequency down-converter and measurement set-up where the larger dashed box includes the on-chip components and the smaller dashed box shows the Josephson heterodyne oscillator-mixer device.

Image of FIG. 3.
FIG. 3.

Heterodyne oscillator frequency versus the control current I R; tuneable from 0.1 to 7 GHz at 30 K.

Image of FIG. 4.
FIG. 4.

Conversion gain as a function of bias current I B at 30 K for a RF signal of 8.4 GHz and −50 dBm, and f LO = 4.435 GHz.

Image of FIG. 5.
FIG. 5.

Frequency response of the MMIC down-converter IF output (conversion gain).

Image of FIG. 6.
FIG. 6.

IF output power and conversion gain as function of the RF signal power at T = 30 K.

Image of FIG. 7.
FIG. 7.

Effective noise temperature versus physical temperature.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Monolithic high-temperature superconducting heterodyne Josephson frequency down-converter