%0 Journal Article
%T Spectrum of thermal fluctuation noise in diffusion and phonon cooled hot-electron mixers
%A Burke, P. J.
%A Schoelkopf, R. J.
%A Prober, D. E.
%A Skalare, A.
%A Karasik, B. S.
%A Gaidis, M. C.
%A McGrath, W. R.
%A Bumble, B.
%A Leduc, H. G.
%J Applied Physics Letters
%D 1998
%V 72
%N 12
%F Burke_etal1998
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=760), last updated on Mon, 30 Apr 2012 20:35:46 -0500
%X A systematic study of the intermediate frequency noise bandwidth of Nb thin-film superconducting hot-electron bolometers is presented. We have measured the spectrum of the output noise as well as the conversion efficiency over a very broad intermediate frequency range (from 0.1 to 7.5 GHz) for devices varying in length from 0.08 μm to 3 μm. Local oscillator and rf signals from 8 to 40 GHz were used. For a device of a given length, the spectrum of the output noise and the conversion efficiency behave similarly for intermediate frequencies less than the gain bandwidth, in accordance with a simple thermal model for both the mixing and thermal fluctuation noise. For higher intermediate frequencies the conversion efficiency decreases; in contrast, the noise decreases but has a second contribution which dominates at higher frequency. The noise bandwidth is larger than the gain bandwidth, and the mixer noise is low, between 120 and 530 K (double side band).
%K HEB mixer
%K thermal fluctuation noise
%K TFN
%P 1516-1518