TY  - CONF
AU  - Baselmans, J. J. A.
AU  - Hajenius, M.
AU  - Gao, J. R.
AU  - Baryshev, A.
AU  - Kooi, J.
AU  - Klapwijk, T. M.
AU  - de Korte, P. A. J.
AU  - Voronov, B.
AU  - Gol’tsman, G.
PY  - 2004
DA  - 2004//
TI  - Hot electron bolometer mixers with improved interfaces: sensitivity, LO power and stability
T2  - Proc. 15[super:th] Int. Symp. Space Terahertz Technol.
BT  - Proc. 15[super:th] Int. Symp. Space Terahertz Technol.
SP  - 17
EP  - 24
KW  - NbN HEB mixers
AB  - We study twin slot antenna coupled NbN hot electron bolometer mixers with an improved contact structure and a small volume, ranging from 1 µm × 0.1 µm to 2 × 0.3 µm. We obtain a DSB receiver noise temperature of 900 K at 1.6 THz and 940 K at 1.9 THz. To explore the practical usability of such small HEB mixers we evaluate the LO power requirement, the sensitivity and the stability. We find that the LO power requirement of the smallest mixers is reduced to about 240 nW at the Si lens of the mixer. This value is larger than expected from the isothermal technique and the known losses in the lens by a factor of 3-3.5. The stability of these receivers is characterized using a measurement of the Allan Variance. We find an Allan time of 0.5 sec. in an 80 MHz bandwidth. A small increase in stability can be reached by using a higher bias at the expense of a significant amount of sensitivity. The stability is sufficient for spectroscopic applications in a 1 MHz bandwidth at a 1 Hz chopping frequency.
UR  - https://www.nrao.edu/meetings/isstt/2004.shtml
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1491), last updated on Tue, 18 May 2021 12:37:30 -0500
ID  - Baselmans_etal2004
ER  -