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This paper presents an optimized envelope tracking operation of Doherty amplifier. By modulating the supply voltage of the carrier amplifier, while that of the peaking amplifier is fixed, the supply modulator provides just a half of the current for the same PA output power. It results in a reduced chip size and the crest factor of the supply modulating signal is reduced by 6dB, enhancing the efficiency...
The input power drive of Doherty power amplifier (PA) is analyzed and a proper input dividing technique without a coupler is introduced. The efficiency and linearity are enhanced by the uneven power drive and proposed output matching circuits. The PA circuit is realized using a 2-mum InGaP/GaAs HBT process and combined using merged lumped-components for Doherty operation. For wireless broadband (WiBro)...
The class-AB/F power amplifier (PA), a multimode PA, which can operate at both class-AB and class-F modes, is analyzed and compared with the conventional class-F and class-AB PAs. The open-circuited third harmonic control circuit enhances the efficiency of the PA without deteriorating the linearity of class-AB mode of the PA. The voltage and current waveforms are simulated to evaluate the appropriate...
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