Title :
Intermodulation nulling in HEMT common source amplifiers
Author :
Parker, Anthony E. ; Qu, Guoli
Author_Institution :
Dept. of Electron., Macquarie Univ., North Ryde, NSW, Australia
fDate :
3/1/2001 12:00:00 AM
Abstract :
A new model of the second- and third-order intermodulation products from HEMT and MESFET small-signal amplifiers, resulting from nonlinear drain-source current has been proposed in our previous publications. Based on this model, intermodulation nulling conditions in terms of the Taylor series coefficients, hence in terms of bias, have been investigated. This paper now examines the load dependence of the second- and third-order intermodulation products in HEMT small-signal common source amplifiers. Intermodulation nulling conditions are proposed and validated. This is useful in designing a high performance amplifier by calculation of optimum load for minimum distortion and studying distortion generation as a function of circuit topology.
Keywords :
HEMT circuits; Volterra series; amplifiers; intermodulation distortion; HEMT common source amplifier; Taylor series; Volterra analysis; circuit topology; intermodulation distortion; intermodulation nulling; nonlinear drain-source current; second-order intermodulation product; small-signal model; third-order intermodulation product; Circuit topology; Equations; HEMTs; Intermodulation distortion; MESFETs; MODFET circuits; Nonlinear distortion; Power amplifiers; Predictive models; Taylor series;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/7260.915618
