Title :
Doherty power amplifier with feedforward linearization
Author :
Xiang, Yong-Bo ; Wang, Guang-Ming
Author_Institution :
Appl. Microwave Lab., AFEU Univ., Xi´´an, China
Abstract :
This paper presents a high efficiency feedforward power amplifier with Doherty technique for multi-carrier GSM base-station. The main Doherty power amplifier (DPA) was designed with third-order intermodulation distortion (IMD3) cancellation technique and tunable power division for optimized linearity and efficiency. The error amplifier was selected based on IMD3 analysis for higher efficiency. Two tone test show the amplifier has an efficiency of 27.2% and an IMD3 below -62.5 dBc at 80 W overall output power, the efficiency is much higher than traditional feedforward amplifiers.
Keywords :
UHF power amplifiers; feedforward amplifiers; intermodulation distortion; linearisation techniques; power dividers; Doherty power amplifier; IMD3 analysis; error amplifier; feedforward linearization; high efficiency feedforward power amplifier; multi-carrier GSM basestation; power 80 W; third-order intermodulation distortion cancellation; tunable power division; GSM; High power amplifiers; Linearity; Linearization techniques; Microwave amplifiers; Operational amplifiers; Power amplifiers; Power generation; Predistortion; Wireless communication; Doherty amplifier; GSM base-station; IMD cancellation; efficiency; feedforward; linearization; multi-carrier;
Conference_Titel :
Microwave Conference, 2009. APMC 2009. Asia Pacific
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-2801-4
Electronic_ISBN :
978-1-4244-2802-1
DOI :
10.1109/APMC.2009.5384357
