NDLI: Josephson effect gain and noise in SIS mixers

Content Provider	IEEE Xplore Digital Library
Author	Wengler, M.J. Dubash, N. Pance, G. Miller, R.E.
Copyright Year	1963
Abstract	The authors report measurements of gain and noise in SIS mixers at 230 and 492 GHz. Measurements were made of relatively high gain and noise associated with Josephson currents that have not been previously reported. These measurements show that Josephson currents are increasingly important as operating frequencies are raised. The techniques used to make these measurements are discussed. Measurements made with hot and cold black-bodies are shown to be inaccurate at high frequencies. The problem is that SIS mixers do not always respond linearly to the signal power incident on them. This is particularly important when (1) very broad band mixers are used and (2) Josephson effect currents are important. Both of these circumstances are present in the quasioptical SIS mixers favored for 500 GHz and higher. Monochromatic signals were used to measure gain and noise to get around these problems.<>
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	820
Ending Page	826
Page Count	7
File Size	776007
File Format	PDF
ISSN	00189480
Volume Number	40
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Josephson effect Superconducting device noise Extraterrestrial measurements Magnetic fields Diodes Frequency Gain measurement Noise measurement Voltage Radio astronomy
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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