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The RF performances of the Doherty amplifier-I (a combination of a class B carrier amplifier and a bias-tuned class C peaking amplifier) have been compared with those of a class B amplifier alone.
Performance comparisons between the Doherty-I and class B amplifier, and between the Doherty-II and class AB amplifiers are performed.
IMD5 is worse at a low power level but it becomes better at a high power level (above 33 dBm), in comparison with the class B amplifier.
The output spectra of the Doherty-I and class B amplifier at a 30 dBm output power, and Doherty-II and class AB amplifier at an output power of 32 dBm are shown in Figure 12.