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
Pub Type: Journals
Amplifier noise parameters, noise measurement, phase shifter, source pull technique, uncertainty analysis