A digital Doherty transmitter suitable for wireless infrastructure efficiency enhancement

The present work proposes a digital Doherty power amplifier (PA) with improved efficiency performance. The efficiency enhancement is achieved by using a digital adaptive phase alignment mechanism that is implemented to address the problem of power-dependent phase imbalance between the carrier and pe...

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Bibliographic Details
Main Authors: Darraji, R., Ghannouchi, F. M.
Format: Conference Proceeding
Language:English
Subjects:
Computer architecture
Degradation
digital signal processing
Doherty power amplifier
dual-input architecture
Gallium nitride
GaN
HEMTs
Power amplifiers
power efficiency
Power generation
Wireless communication
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Summary:The present work proposes a digital Doherty power amplifier (PA) with improved efficiency performance. The efficiency enhancement is achieved by using a digital adaptive phase alignment mechanism that is implemented to address the problem of power-dependent phase imbalance between the carrier and peaking cells of gallium-nitride (GaN) Doherty PAs following the turn-on of the peaking cell. An average efficiency of 57% has been measured using a one-carrier Worldwide Interoperability for Microwave Access (WiMAX) signal with a peak-to-average power ratio of 7 dB. This corresponds to an improvement of 7% in average efficiency with no linearity degradation compared to a conventional single-input fully analog Doherty PA.
ISSN:2157-9822
2157-9830
DOI:10.1109/MMS.2011.6068550