NOISE-PARAMETER MEASUREMENTS WITH A REFLECTION TYPE PHASE SHIFTER

作者：Gu Dazhen^*; Walter David K; Randa James

来源：Microwave and Optical Technology Letters, 2010, 52(11): 2600-2603.

DOI：10.1002/mop.25532

• amplifier noise parameters
• noise measurement
• phase shifter
• source pull technique
• uncertainty analysis

We report a miniaturized phase shifter operating in the frequency range from 5 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 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.

• 出版日期2010-11