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We propose a load network, consisting of an optimized impedance transformer, for a Doherty amplifier. This load network allows the carrier and peaking amplifiers to have different load impedance. This results in better IM3 cancellation. Using a four‐carrier down‐link WCDMA signal, we achieved 0.95 dB higher output power level and 2.21% higher power‐added efficiency compared to a conventional Doherty amplifier at an ACLR level of −30 dBc.
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Jung et al. (2009) studied this question.
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