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Shot-noise in resistive-diode mixers and the attenuator noise modelThe representation of a pumped exponential diode, operating as a mixer, by an equivalent lossy network, is reexamined. It is shown that the model is correct provided the network has ports for all sideband frequencies at which (real) power flow can occur between the diode and its embedding. The temperature of the equivalent network is eta/2 times the physical temperature of the diode. The model is valid only if the series resistance and nonlinear capacitance of the diode are negligible. Expressions are derived for the input and output noise temperature and the noise-temperature ratio of ideal mixers. Some common beliefs concerning noise-figure and noise-temperature ratio are shown to be incorrect.
Document ID
19790040001
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kerr, A. R.
(NASA Goddard Institute for Space Studies New York, N.Y., United States)
Date Acquired
August 9, 2013
Publication Date
February 1, 1979
Publication Information
Publication: IEEE Transactions on Microwave Theory and Techniques
Volume: MTT-27
Subject Category
Electronics And Electrical Engineering
Accession Number
79A24014
Distribution Limits
Public
Copyright
Other

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