A 60W class S and outphasing hybrid digital transmitter for wireless communication

This paper presents a digital RF outphasing transmitter with delta sigma modulation for future all digital wireless systems. Wireless systems make use of complex signals with high Peak to Average Power Ratio (PAPR). High PAPR degrades efficiency performance of RF power amplifiers which results in po...

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Bibliographic Details
Published in2018 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR) pp. 8 - 11
Main Author Sen, Bulent
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.01.2018
Subjects
ACPR
Chireix Combiner
Class D RF power amplifier
Class S transmitter
Delta Sigma Modulation (DSM)
Delta-sigma modulation
LTE
Outphasing
PAPR
PDF
Peak to average power ratio
Power amplifiers
Radio frequency
signal decomposition
Transmitters
Wideband
Wireless communication
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Summary:This paper presents a digital RF outphasing transmitter with delta sigma modulation for future all digital wireless systems. Wireless systems make use of complex signals with high Peak to Average Power Ratio (PAPR). High PAPR degrades efficiency performance of RF power amplifiers which results in power hungry transmitter design. On the other hand, high PAPR also dictates linear power amplification to maintain signal quality and spectral efficiency, which then compromise efficient use of power sources. RF outphasing transmitters lead the way to efficiently amplify amplitude varying wireless communication signals with switch mode RF power amplifiers. However, considerable loss occurs at the RF power combiner due to large outphasing angle variation. An all-digital outphasing transmitter with class D RF power amplifiers at UHF band is developed and fed with digitally modulated LTE outphasing signal to optimize efficiency and linearity. 70 W output power with %26 power efficiency at 8.7dB PAPR is achieved with -20 dB Adjacent Channel Power Ratio (ACPR) performance.
ISSN:2473-4640
DOI:10.1109/PAWR.2018.8310053