Randa, J.
(2001),
Noise Characterization of Multiport Amplifiers, IEEE Transactions on Microwave Theory and Techniques, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=5219
(Accessed May 11, 2025)
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Noise Characterization of Multiport Amplifiers
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Abstract
I address the issue of the definition and measurement of noise figure and parameters to characterize multiport devices, particularly differential amplifiers. A parameterization in terms of the noise matrix appears to be the most practical. the noise figure for a given output port is defined and related to the noise matrix and scattering parameters of the device. Two examples are considered in detail: a 3-port differential amplifier and a 4-port mixed-mode amplifier, both with reflectionless terminations. The noise figures, effective input temperatures, and gains are related to the results of a series of hot-cold measurements, as in the familiar two-port case.Citation
IEEE Transactions on Microwave Theory and Techniques
Volume
49
Issue
10
Pub Type
Journals
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Keywords
amplifier noise, differential amplifier, multiport amplifier, noise, noise figure, noise matrix, thermal noise
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Created October 1, 2001, Updated January 27, 2020