Patent ID: 9366710
Filing Date: 2016-06-14
CPC Classification: G01R

Claim Text:
1. A method for extracting the four noise parameters of low noise transistors over a broad frequency band uses, at each frequency inside said band, noise figure data F(Γs.i) measured for a multitude of at least 7 source reflection factor points Γs.i, with i≧7, randomly distributed over the source Smith chart; whereby, at each frequency inside said band, each said noise parameter is extracted using noise figure F(Γs.i) data measured under different sets of source reflection factors as follows: a) identify the smallest measured noise figure Fo and associated source reflection factor Γs.o; b) use noise figure data F(Γs.i) measured for reflection factors Γs.i included in a cluster of points with a radius of approximately 0.2 reflection factor units, in proximity and surrounding Γs.o, to extract noise parameters with emphasis on minimum noise figure (Fmin) and optimum source reflection factor Γopt; c) identify a set of noise figure data points measured for reflection factors Γs.j included in a cluster of points with a radius of approximately 0.1 and being placed approximately anti-diametric to Γopt with respect to the center of the Smith chart; d) extract noise parameters using data points used in steps a) and c) with emphasis on equivalent noise resistance (Rn); e) save noise parameter data for Fmin and Γopt extracted in step b) and Rn in step d).