PT Journal
AU Gol'tsman, GN
   Karasik, BS
   Okunev, OV
   Dzardanov, AL
   Gershenzon, EM
   Ekstrom, H
   Jacobsson, S
   Kollberg, E
TI NbN hot electron superconducting mixers for 100 GHz operation
SO IEEE Trans. Appl. Supercond.
JI IEEE Trans. Appl. Supercond.
PY 1995
BP 3065
EP 3068
VL 5
IS 2
DI 10.1109/77.403239
DE NbN HEB mixers
AB NbN is a promising superconducting material for hot-electron superconducting mixers with an IF bandwidth larger than 1 GHz. In the 1OO GHz frequency range, the following parameters were obtained for 50 /spl Aring/ thick NbN films at 4.2 K: receiver noise temperature (DSB) /spl sim/1000 K; conversion loss /spl sim/10 dB; IF bandwidth /spl sim/1 GHz; and local oscillator power /spl sim/1 /spl mu/W. An increase of the critical current of the NbN film, increased working temperature, and a better mixer matching may allow a broader IF bandwidth up to 2 GHz, reduced conversion losses down to 3-5 dB and a receiver noise temperature (DSB) down to 200-300 K.
ER