Spatial separation of the third-order intermodulation for amplifier linearization |
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| Authors: | A. Podcameni C. R. Riback |
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| Affiliation: | 1. Telecommunications Studies Center of the Catholic University of Rio de Janeiro, GSOM/CETUC/PUC-Rio , Rua Marques de Sao Vicente 225–22453-900, Rio de Janeiro, Brazil;2. Telecommunications Studies Center of the Catholic University of Rio de Janeiro, GSOM/CETUC/PUC-Rio , Rua Marques de Sao Vicente 225–22453-900, Rio de Janeiro, Brazil;3. C. R. Riback is on leave from the Brazilian Navy to follow an MSc programme |
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| Abstract: | A quadrature balanced structure is presented for linearizing amplifiers. It works by routing the most annoying distortion component (the third-order intermodulation) to a port, while routing the useful information signals to a distinct port. This arrangement is not prone to oscillations as the negative feedback method is. It also has advantages over predistortion and feedforward linearization methods, as it is simpler and needs no adjustments. Theoretically, third-order intermodulation products would be totally eliminated when using the proposed arrangement. In practice, it was observed that, even with non-perfectly balanced amplifiers, the third-order intermodulation level was reduced up to 17?dB. The fifth-order intermodulation components were not reduced. |
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