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Noise characteristics of a NbN hot-electron mixer at 2.5 THz

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8 Author(s)
Semenov, A.D. ; Inst. fur Angewandte Phys., Regensburg Univ., Germany ; Gousev, Y.P. ; Renk, K.F. ; Voronov, B.M.
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The noise temperature of a NbN phonon cooled hot-electron mixer has been measured at a frequency of 2.5 THz for various operating conditions. We obtained for optimal operation a double sideband mixer noise temperature of /spl ap/14000 K and a system conversion loss of /spl ap/23 dB at intermediate frequencies up to 1 GHz. The dependences of the mixer noise temperature on the bias voltage, local oscillator power, and intermediate frequency were consistent with the phenomenological description based on the effective temperature approximation.

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Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 2 )