Title :
A 20-W Chireix Outphasing Transmitter for WCDMA Base Stations
Author :
Huttunen, Anu ; Kaunisto, Risto
Author_Institution :
Nokia Res. Center, Helsinki
Abstract :
A Chireix outphasing transmitter demonstrator targeting WCDMA base stations was implemented. The system consists of two upconversion branches, a low-loss combiner optimized for saturated LDMOS PAs and digital signal generation and calibration. Path imbalances, quadrature errors and DC offsets were removed using background calibration. The measurements showed close to 30-% output efficiency at more than 20 W output power for one carrier. The best achieved adjacent channel power ratio was -45 dB.
Keywords :
UHF power amplifiers; calibration; cellular radio; code division multiple access; radio transmitters; Chireix outphasing transmitter; DC offsets; LDMOS power amplifiers; WCDMA base stations; background calibration; cellular base station; digital signal generation; low-loss combiner; power 20 W; quadrature errors; radio transmitters; upconversion branches; Base stations; Calibration; Coaxial components; Linearity; Multiaccess communication; Power amplifiers; Power generation; Radio transmitters; Signal generators; Testing; Outphasing; power amplifiers; radio transmitters;
Conference_Titel :
Microwave Symposium, 2007. IEEE/MTT-S International
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0688-9
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2007.380503
