FET Noise-Parameter Determination Using a Novel Technique Based on 50-Noise-Figure Measurements

A novel method for measuring the four noise parameters of a field-effect transistor (FET) is presented. It is based on the determination of its intrinsic noise matrix elements [C 11 , C INT 22 , Re(C INT 12 ), Im(C INT 12 )] by fitting the measured device noise figure for a matched source reflection coefficient(F50) at a number of frequency points, thus, a tuner is not required. In contrast to previous works, no restrictive assumptions are made on the intrinsic noise sources. The receiver full-noise calibration is easily performed by using a set of coaxial and on-wafer standards that are commonly available in a microwave laboratory, thus, an expensive broad-band tuner is not required for calibration either. On-wafer experimental verification up to 26 GHz is presented and a comparison with otherF50-based and tunerbased methods is given. As an application, the dependence of the FET intrinsic noise sources as a function of the bias drain–current and gate–length is obtained.

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