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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