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Design and Performance of a 600–720GHz Sideband-Separating Receiver Using ${\hbox{AlO}}_{x}$ and AlN SIS Junctions

# Design and Performance of a 600–720GHz Sideband-Separating Receiver Using ${\hbox{AlO}}_{x}$ and AlN SIS Junctions,10.1109/TMTT.2010.2090417,IEEE Tran

Design and Performance of a 600–720GHz Sideband-Separating Receiver Using ${\hbox{AlO}}_{x}$ and AlN SIS Junctions
We present the design, modeling, construction, and characterization of a sideband separating heterodyne receiver that covers the frequency range from 600 to 720 GHz. The receiver has been constructed using waveguide technology in the split-block technique. The core of the mixer consists of a quadrature hybrid, two directional couplers to inject the local oscillator signal, two superconductor-insulator-superconductor (SIS) junctions, three signal-termination loads, and two planar IF/bandpass-filter/dc-bias circuits. The instrument that we have constructed presents excellent performance as demonstrated by two important figures of merit: receiver noise temperature and sideband ratio. Across the entire band, the uncorrected single-side- band noise temperature is below 500 K and reaches 190 K at the best operating point. The sideband ratio is greater than 10 dB over most of the frequency operating range. Superconducting junctions containing AlO - and AlN-tunnel barriers were tested.
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## Citation Context (1)

• ...Using a similar convention as [5], the ideal process of subharmonic down conversion from the RF port to the IF I and Q ports can be described by expressing the down-converted IF voltages and at the respective I and Q ports...

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