Title :
Large- and small-signal IMD behavior of microwave power amplifiers
Author :
De Carvalho, Nuno Borges ; Pedro, José Carlos
Author_Institution :
Inst. de Telecommun., Aveiro Univ., Portugal
fDate :
12/1/1999 12:00:00 AM
Abstract :
In this paper, large-signal intermodulation distortion (IMD) sweet spots in microwave power amplifiers are studied and predicted using a new mathematical basis. The variations in the IMD versus drive pattern with active bias point and the terminating matching networks are investigated. This nonlinear distortion model enabled the design of power amplifiers specially tailored to present a desired IMD versus drive-level pattern. For practical validation purposes, a MESFET case study and an illustrative application example are presented
Keywords :
MESFET circuits; Volterra series; equivalent circuits; impedance matching; intermodulation distortion; microwave power amplifiers; C-band MESFET amplifier; IMD sweet spots; active bias point; drive-level pattern; intermodulation distortion; large-signal IMD behavior; microwave power amplifiers; nonlinear distortion model; small-signal IMD behavior; terminating matching networks; Degradation; Harmonic distortion; Intermodulation distortion; MESFETs; Microwave amplifiers; Nonlinear distortion; Operational amplifiers; Pattern matching; Power amplifiers; Power generation;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
