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Resistance vs temperature dependence for the mixer. The inset zooms into the superconducting transition.
Current-voltage curves of the mixer at bath temperature: without LO power (a) and with LO power applied [(b)–(e)]. The maximum mixer gain was obtained for . The curves are obtained with a bias voltage source.
Intermediate frequency response of the mixer at LO and for different bias points (symbols). The dashed lines are the least square fit to the experimental data. The solid line is the result of the TTM simulations.
DSB mixer noise temperature obtained from the -factor measurements (triangles), as well as after correction for the bolometer-antenna mismatch loss of (squares), vs the intermediate frequency. The LO frequency is .
Debye temperature , mass density , speed of sound , and electron specific heat coefficient for NbN and films as well as for some typical substrates.
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