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(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).
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.
Heterodyne oscillator frequency versus the control current I R; tuneable from 0.1 to 7 GHz at 30 K.
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.
Frequency response of the MMIC down-converter IF output (conversion gain).
IF output power and conversion gain as function of the RF signal power at T = 30 K.
Effective noise temperature versus physical temperature.
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