PT Journal
AU Jiang, L
   Miao, W
   Zhang, W
   Li, N
   Lin, ZH
   Yao, QJ
   Shi, S
   Svechnikov, SI
   Vakhtomin, YB
   Antipov, SV
   Voronov, BM
   Kaurova, NS
   Gol'tsman, GN
TI Characterization of a quasi-optical NbN superconducting HEB mixer
SO IEEE Trans. Microwave Theory Techn.
JI IEEE Trans. Microwave Theory Techn.
PY 2006
BP 2944
EP 2948
VL 54
IS 7
DI 10.1109/TMTT.2006.877450
DE NbN HEB mixers
AB In this paper, the performance of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer, cryogenically cooled by a close-cycled 4-K refrigerator, is thoroughly investigated at 300, 500, and 850 GHz. The lowest receiver noise temperatures measured at the respective three frequencies are 1400, 900, and 1350 K, which can go down to 659, 413, and 529 K, respectively, after correcting the loss and associated noise contribution of the quasi-optical system before the measured superconducting HEB mixer. The stability of the quasi-optical superconducting HEB mixer is also investigated here. The Allan variance time measured with a local oscillator pumping at 500 GHz and an IF bandwidth of 110 MHz is 1.5 s at the dc-bias voltage exhibiting the lowest noise temperature and increases to 2.5 s at a dc bias twice that voltage.
ER