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Multiport Noise Characterization and Differential Amplifiers

Published

Author(s)

James P. Randa

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. As an example, the case of a differential amplifier with reflectionless terminations is considered in detail. The noise figure, effective input temperature, and gains are related to the results of a series of hot-cold measurements, as in the familiar two-port case.
Proceedings Title
Tech Dig., Auto. RF Tech. Group Conf.
Conference Dates
June 15-16, 2000
Conference Location
Boston, MA

Keywords

amplifier noise, differential amplifier, multiport amplifier, noise, noise figure, noise matrix, thermal noise

Citation

Randa, J. (2000), Multiport Noise Characterization and Differential Amplifiers, Tech Dig., Auto. RF Tech. Group Conf., Boston, MA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=24909 (Accessed February 29, 2024)
Created June 1, 2000, Updated February 19, 2017