FEEDFORWARD DISTORTION COMPENSATING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To obtain a feedforward distortion compensating circuit that can provide an output and a power efficiency higher than those of a conventional circuit. SOLUTION: An output supplement loop L3 feedfowards part of an input signal into a distortion elimination loop L2. This feedforward signal is a signal which includes a carrier component but does not include a distortion component, resulting in increasing a carrier output of an auxiliary amplifier SUB and this increment compensates a loss in a hybrid HYB3. Or breaking the control state of a modulator MOD may be set to leak a carrier component from the hybrid HYB 2 toward the auxiliary amplifier SUB in place of the provision of the output supplement loop L3.