Chapter Five

Linear Doherty Power Amplifier for Handset Application


Doherty power amplifier is a good solution for amplification of a high PAPR signal as clearly seen from the popularity in the base-station amplification. But the amplifier is less popular for handset application because of the nonlinear behavior and complex circuit topology. However, those problems can be solved by elaborated circuit design works. The bulky input power divider and quarter-wavelength transmission line can be replaced by simple circuits with small sizes. Therefore, the Doherty structure could be integrated into a single chip with a small size. The linear Doherty power amplifier is realized by the harmonic cancellation between the carrier and peaking ...

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