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Gain and noise bandwidth of NbN hot-electron bolometric mixers

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6 Author(s)
Ekstrom, H. ; Chalmers University of Technology, 412 96 Gothenburg, Sweden ; Kollberg, E. ; Yagoubov, P. ; Goltsman, G.
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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. © 1997 American Institute of Physics.

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Applied Physics Letters  (Volume:70 ,  Issue: 24 )