Title :
A 250W LDMOS Doherty PA with 31% of fractional bandwidth for DVB-T applications
Author :
Giovannelli, Niccolo ; Cidronali, Alessandro ; Singerl, Peter ; Maddio, Stefano ; Schuberth, Christian ; Del Chiaro, Alessio ; Manes, Gianfranco
Author_Institution :
Infineon Technol. AG, Neubiberg, Germany
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.
Keywords :
MOS analogue integrated circuits; digital video broadcasting; distortion; power amplifiers; wideband amplifiers; DVB-T; LDMOS Doherty power amplifiers; bandwidth 550 MHz to 770 MHz; bandwidth 8 MHz; digital predistortion; multisection impedance transformation; power 250 W; wideband LDMOS Doherty PA; wideband output combiner; Digital video broadcasting; Microwave amplifiers; Prototypes; Radio frequency; Broadband PA; DVB-T; Doherty Power Amplifier; LDMOS;
Conference_Titel :
Microwave Symposium (IMS), 2014 IEEE MTT-S International
Conference_Location :
Tampa, FL
DOI :
10.1109/MWSYM.2014.6848331
