Measuring Noise Parameters Using an Open, Short, Load, and λ/8Length Cable as Source Impedances
Abstract
Noise parameters are a set of four measurable quantities which determine the noise performance of a radiofrequency device under test. The noise parameters of a 2port device can be extracted by connecting a set of 4 or more source impedances at the device's input, measuring the noise power of the device with each source connected, and then solving a matrix equation. However, sources with high reflection coefficients cannot be used due to a singularity that arises in entries of the matrix. Here, we detail a new method of noise parameter extraction using a singularityfree matrix that is compatible with highreflection sources. We show that open, short, load and an open cable ("OSLC") can be used to extract noise parameters, and we detail a practical measurement approach. The OSLC approach is particularly wellsuited for lownoise amplifier measurement at frequencies below 1 GHz, where alternative methods require physically large apparatus.
 Publication:

IEEE Transactions on Microwave Theory Techniques
 Pub Date:
 March 2023
 DOI:
 10.1109/TMTT.2022.3225317
 arXiv:
 arXiv:2210.07080
 Bibcode:
 2023ITMTT..71.1102P
 Keywords:

 Astrophysics  Instrumentation and Methods for Astrophysics
 EPrint:
 IEEE Transactions on Microwave Theory and Techniques