Title :
Low intermodulation amplifier for PHS applications
Author :
Tsiorlidas, Dimitrios ; Budimir, Djuradj
Author_Institution :
Dept. of Electron. Syst., Westminster Univ., London, UK
Abstract :
An amplifier where the third order IM distortion has been reduced is proposed. If two signals at different carrier frequencies are incident at the input of an amplifier, due to the nonlinearity, these signals will interact with each other and the output will contain additional signals at all combinations of sum and difference of these frequencies, which are IM products. The injection of the second harmonics of the two input in the amplifier together with the fundamental signals will produce additional IM products at the output. By proper selection of phase and amplitude of the injected second harmonics, it is possible to make the third order IM products produced by the second harmonics and the original third order IM products out of phase and equal in amplitude. As. A result third order IM products will be eliminated, in principle. Theory and simulation results obtained at 1.9 GHz are presented which supports the suggestion. The output spectrum of the RF power amplifier is given
Keywords :
MESFET circuits; UHF power amplifiers; circuit CAD; circuit simulation; harmonic analysis; intermodulation; nonlinear network analysis; personal communication networks; 1.9 GHz; CAD simulation; MESFET; PHS applications; RF power amplifier; UHF; amplifier nonlinearity; amplitude selection; carrier frequencies; low intermodulation amplifier; output spectrum; phase selection; second harmonics; simulation results; third order IM distortion reduction; third order IM products; Circuit simulation; Communication systems; Laboratories; MESFETs; Power amplifiers; Power generation; Radio frequency; Radiofrequency amplifiers; Transmitters; Wireless communication;
Conference_Titel :
High Frequency Postgraduate Student Colloquium, 1999
Conference_Location :
Leeds
Print_ISBN :
0-7803-5577-6
DOI :
10.1109/HFPSC.1999.809290
