Noise-Parameter Measurements with a Reflection Type Phase Shifter

Published

November 1, 2010

Author(s)

Dazhen Gu, Dave K. Walker, James P. Randa

Abstract

We report a miniaturized phase shifter operating in the frequency range from 5 GHz to 7 GHz for noise-parameter extraction. Such a tunable solid-state unit represents a significant reduction in the size and mass as a source-pull component, compared to its mechanical counterparts. It provides adequate impedance coverage, ultra-fast response, as well as high repeatability, across the designed region. A packaged low noise amplifier was measured at integer frequencies (5 GHz, 6 GHz, and 7 GHz) by use of the phase shifter on the NIST NFRad system. The measured results exhibited good accuracy. The combined uncertainties (Type-A and Type-B) are below 6 % for both the minimum noise temperature and the magnitude of the optimum input reflection coefficient.

Citation

Microwave and Optical Technology Letters

Volume

52

Issue

11

Pub Type

Journals

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Keywords

Amplifier noise parameters, noise measurement, phase shifter, source pull technique, uncertainty analysis

Citation

Gu, D. , Walker, D. and Randa, J. (2010), Noise-Parameter Measurements with a Reflection Type Phase Shifter, Microwave and Optical Technology Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904104 (Accessed November 3, 2025)