Use of super Schottky diodes in a cryogenic radio frequency superconducting quantum interference device readout
作者:
M. Mu¨ck,
Th. Becker,
C. Heiden,
期刊:
Applied Physics Letters
(AIP Available online 1995)
卷期:
Volume 66,
issue 3
页码: 376-378
ISSN:0003-6951
年代: 1995
DOI:10.1063/1.114218
出版商: AIP
数据来源: AIP
摘要:
We describe the fabrication and characterization of super Schottky diodes which are used in the cryogenic part of a 3 GHz radio frequency superconducting quantum interference device (rf SQUID) readout electronics. The diodes were prepared on silicon wafers with ann‐doping level of 5×1024m−3. They exhibited sensitivities of 1500 V−1at 4.2 K, and a noise equivalent power of 2×10−15W/&sqrt;Hz was measured at 2.1 GHz. Using planar niobium 3 GHz rf SQUIDs and a cooled rf amplifier, experiments have been performed to investigate the feasibility of these super Schottky diodes for demodulation of the SQUID rf signal voltage. A simple cryogenic rf SQUID readout, employing two transistors and one super Schottky diode is described and investigated. Flux noise measurements in an open loop have been performed using this readout. ©1995 American Institute of Physics.
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