optimum noise figure of a two-port device
noise figure at the given transducer operating point and at specified frequency is the lowest noise figure that can be obtained through adjustment of the source immittance, mürategur antud muunduri tööpunktis ja kindlaksmääratud sagedusel, mis on madalaimaks mürateguriks, mida on võimalik saavutada allika immitantsi reguleerimisega