We discuss the development of a wideband LDMOS Doherty PA (DPA) with optimized peak power and efficiency over 550 MHz to 770 MHz of bandwidth. The design was enabled by a wideband output combiner which involves multisection impedance transformation. The DPA delivers more than 46% average efficiency across the band at 48 dBm average power supporting DVB-T signal with 8 MHz bandwidth and PAPR of 10.5 dB. The DPA prototype achieves the target ACPR of - 50 dBc at the upper limit of the bandwidth if digital predistortion is applied.
A 250W LDMOS Doherty PA with 31% of fractional bandwidth for DVB-T applications / Giovannelli, Niccolo; Cidronali, Alessandro; Singerl, Peter; Maddio, Stefano; Schuberth, Christian; Del Chiaro, Andrea; Manes, Gianfranco. - ELETTRONICO. - (2014), pp. 1-4. (Intervento presentato al convegno 2014 IEEE MTT-S International Microwave Symposium, IMS 2014 tenutosi a Tampa, FL, usa nel 2014) [10.1109/MWSYM.2014.6848331].
A 250W LDMOS Doherty PA with 31% of fractional bandwidth for DVB-T applications
GIOVANNELLI, NICCOLO';CIDRONALI, ALESSANDRO;MADDIO, STEFANO;MANES, GIANFRANCO
2014
Abstract
We discuss the development of a wideband LDMOS Doherty PA (DPA) with optimized peak power and efficiency over 550 MHz to 770 MHz of bandwidth. The design was enabled by a wideband output combiner which involves multisection impedance transformation. The DPA delivers more than 46% average efficiency across the band at 48 dBm average power supporting DVB-T signal with 8 MHz bandwidth and PAPR of 10.5 dB. The DPA prototype achieves the target ACPR of - 50 dBc at the upper limit of the bandwidth if digital predistortion is applied.
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