PT Journal
AU Ekstörm, H
   Kollberg, E
   Yagoubov, P
   Gol'tsman, G
   Gershenzon, E
   Yngvesson, S
TI Gain and noise bandwidth of NbN hot-electron bolometric mixers
SO Appl. Phys. Lett.
JI Appl. Phys. Lett.
PY 1997
BP 3296
EP 3298
VL 70
IS 24
DI 10.1063/1.119143
DE NbN HEB mixers; conversion loss; conversion gain; U-factor technique
AB We have measured the noise performance and gain bandwidth of 35 Å thin NbN hot-electron mixers integrated with spiral antennas on silicon substrate lenses at 620 GHz. The best double-sideband receiver noise temperature is less than 1300 K with a 3 dB bandwidth of ≈5 GHz. The gain bandwidth is 3.2 GHz. The mixer output noise dominated by thermal fluctuations is 50 K, and the intrinsic conversion gain is about −12 dB. Without mismatch losses and excluding the loss from the beamsplitter, we expect to achieve a receiver noise temperature of less than 700 K.
ER