New Approach of Efficiency Improvement in 10 dB Doherty Power Amplifier for 4G LTE and 5G Wireless Applications

Abstract

─ In this research article, the design procedure and comparative analysis of the 10 dB Doherty power amplifier (DPA) with single and double auxiliary amplifier for maximum efficiency has been presented. A new Doherty amplifier structure with parallel two auxiliary amplifiers based on conventional design having optimum value of load resistance of 3.162 ohm has been proposed with higher efficiency of 85.803% and analyzed with n-tone sinusoidal signal. The proposed Doherty power amplifier can achieve drain efficiency of 83.299% & with single and 85.803% with dual auxiliary amplifier at the output power back, off of 10 dB from the saturated power point. The simulated outputs are matched with mathematically derived design values. The simulated n-tone time response shows that the proposed design of DPA can able to handle different modulation standards at different frequencies with compatible structure. Index Terms ─ Auxiliary amplifier, Doherty power amplifier, efficiency, peak to average power ratio, transceiver, wireless communication.