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Checks of Amplifier Noise-Parameter Measurements



James P. Randa, Dave K. Walker


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


amplifier, noise, noise measurement, noise parameters


Randa, J. and Walker, D. (2004), Checks of Amplifier Noise-Parameter Measurements, ARFTG Microwave Measurement Conference, Fort Worth, TX, USA, [online], (Accessed April 15, 2024)
Created June 10, 2004, Updated October 12, 2021