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A novel efficiency improvement technique for Doherty power amplifiers

A new efficiency improvement technique is proposed for Doherty power amplifiers (PA), which combines supply switching with load modulation. The proposed technique was demonstrated with a commercial prototype GaN PA. Measurement and simulation results for the Doherty PA, using a 5 MHz LTE signal, showed that the proposed technique significantly improved the average power-added efficiency (PAE) to ~55 %.