Checks of Amplifier Noise-Parameter Measurements

Published

June 11, 2004

Author(s)

James P. Randa, Dave K. Walker

Abstract

We propose two verification methods for measurements of noise parameters of amplifiers, particularly low-noise amplifiers (LNAs). One method is a direct measurement of the parameter Trev, the noise temperature from the amplifier input, and the comparison of that to the value derived from the noise-parameter measurement. The other check involves the measurement of the noise parameters for the amplifier with an isolator connected to the input and comparison to the noise parameters of the amplifier alone. Relationships between the noise parameters with and without the isolator are given. We demonstrate both verification methods with measurements on a sample LNA in the 8 ' 12 GHz range. Uncertainties in the noise parameters are evaluated using a previously developed Monte Carlo method, and both checks are found to be satisfied within the uncertainties.

Conference Dates

June 11, 2004

Conference Location

Fort Worth, TX, USA

Conference Title

ARFTG Microwave Measurement Conference

Pub Type

Conferences

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Keywords

amplifier, noise, noise measurement, noise parameters

Citation

Randa, J. and Walker, D. (2004), Checks of Amplifier Noise-Parameter Measurements, ARFTG Microwave Measurement Conference, Fort Worth, TX, USA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31669 (Accessed October 13, 2025)