Title :
A Comparison for a Doherty power amplifier linearized using digital predistortion and feedforward compensation
Author :
Braithwaite, R. Neil
Abstract :
A Doherty power amplifier (PA) is linearized using digital predistortion (DPD) and feedforward compensation. Power consumption and ACLR of the linearized PAs are measured and compared for a WCDMA signal. The PA used as the test device corresponds to the main amplifier of a feedforward power amplifier (FFPA). For the DPD tests, the error amplifier is turned off. For a given DC supply voltage, the DPD-compensated PA has better efficiency and worse ACLR than the FFPA. The efficiencies of the FFPA and DPD-corrected PA become similar when the DC supply voltage can be reduced because the DPD solution requires a higher supply voltage than the FFPA to meet the ACLR specification.
Keywords :
feedforward amplifiers; linearisation techniques; power amplifiers; power consumption; ACLR specification; DC supply voltage; DPD test device; FFPA; PA; WCDMA signal; digital predistortion; doherty power amplifier linearization; error amplifier; feedforward Compensation; feedforward power amplifier; power consumption; Feedforward neural networks; Indexes; Multiaccess communication; Radio frequency; Spread spectrum communication; Transmitters; Wireless communication; Linearization; digital predistortion; feedforward compensation; power amplifiers;
Conference_Titel :
Microwave Symposium (IMS), 2015 IEEE MTT-S International
Conference_Location :
Phoenix, AZ
DOI :
10.1109/MWSYM.2015.7166827
