Measuring Noise Parameters Using an Open, Short, Load, and λ/8-Length Cable as Source Impedances

Noise parameters are a set of four measurable quantities which determine the noise performance radio-frequency device under test. The 2-port can be extracted by connecting 4 or more source impedances at device's input, measuring power with each connected, and then solving matrix equation. However, sources high reflection coefficients cannot used due to singularity that arises in entries matrix. Here, we detail new method parameter extraction using singularity-free is compatible high-reflection sources. We show open, short, load an open cable ("OSLC") extract parameters, practical measurement approach. OSLC approach particularly well-suited for low-noise amplifier frequencies below 1 GHz, where alternative methods require physically large apparatus.