TY  - JOUR
AU  - Burke, P. J.
AU  - Schoelkopf, R. J.
AU  - Prober, D. E.
AU  - Skalare, A.
AU  - Karasik, B. S.
AU  - Gaidis, M. C.
AU  - McGrath, W. R.
AU  - Bumble, B.
AU  - Leduc, H. G.
PY  - 1998
DA  - 1998//
TI  - Spectrum of thermal fluctuation noise in diffusion and phonon cooled hot-electron mixers
T2  - Appl. Phys. Lett.
JO  - Applied Physics Letters
SP  - 1516
EP  - 1518
VL  - 72
IS  - 12
KW  - HEB mixer
KW  - thermal fluctuation noise
KW  - TFN
AB  - 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).
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=760), last updated on Mon, 30 Apr 2012 20:35:46 -0500
ID  - Burke_etal1998
ER  -