Length scaling of bandwidth and noise in hot-electron superconducting mixers

被引：58

作者：

Burke, PJ ^{[1
]}

Schoelkopf, RJ ^{[1
]}

Prober, DE ^{[1
]}

Skalare, A ^{[1
]}

McGrath, WR ^{[1
]}

Bumble, B ^{[1
]}

LeDuc, HG ^{[1
]}

机构：

[1] CALTECH,JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,PASADENA,CA 91109

来源：

APPLIED PHYSICS LETTERS | 1996年 / 68卷 / 23期

关键词：

D O I：

10.1063/1.116052

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Mixing experiments have been performed at frequencies from 4 to 20 GHz on Nb thin-film superconducting hot-electron bolometers varying in length from 0.08 to 3 mu m. The intermediate frequency (IF) bandwidth is found to vary as L(-2), with L the bridge length, for devices shorter than root 12 L(e-ph) approximate to 1 mu m, with L(e-ph) the electron-phonon length. The shortest device has an IF bandwidth greater than 6 GHz, the largest reported for a low-T-c superconducting bolometric mixer. The conversion efficiencies range from -5 to -11 dB (single sideband, SSB). For short bridges, the mixer noise temperature is found to be as low as 100 K (double sideband, DSB), with little length dependence. The local oscillator power required is small, approximate to 10 nW. Such mixers are very promising for low-noise THz heterodyne receivers. (C) 1996 American Institute of Physics.

引用

页码：3344 / 3346

页数：3

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