Application Note

Designing a Modified Three-Level Doherty Amplifier for Use in Next-Generation Communication Systems

Today’s communication systems often use complex modulation techniques with peak-to-average ratio (PAR) signals of 9 dB and higher, requiring power amplifiers (PAs) in these systems to operate below the power levels that would yield optimum power-added efficiency (PAE). This application note presents an overview and explanation of the operating principle of a modified three-level Doherty amplifier compared to a conventional three-way Doherty architecture and discusses the design challenges faced with this type of amplifier.