Title :
A 2.7-kW, 29-MHz class-E/Fodd amplifier with a distributed active transformer
Author :
Jeon, Sanggeun ; Rutledge, David B.
Author_Institution :
Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA, USA
Abstract :
A class-E/Fodd high power amplifier (PA) using the distributed active transformer (DAT) is demonstrated at 29MHz. The DAT combines the output power from four VDMOS push-pull pairs. The zero voltage switching (ZVS) condition is investigated and modified for the class-E/Fodd amplifier with a non-ideal output transformer. All lumped elements including the DAT and the transistor package are modeled and optimized to achieve the ZVS condition and the high drain efficiency. The PA exhibits 2.7kW output power with 79% drain efficiency and 18dB gain at 29MHz.
Keywords :
UHF power amplifiers; impedance convertors; zero voltage switching; 18 dB; 2.7 kW; 29 MHz; VDMOS push-pull pairs; class-E amplifier; class-Fodd amplifier; distributed active transformer; high power amplifier; lumped elements; nonideal output transformer; switching amplifiers; transistor package; zero voltage switching condition; Biomedical imaging; CMOS process; Distributed amplifiers; High power amplifiers; Power amplifiers; Power generation; Radio frequency; Radiofrequency amplifiers; Slabs; Zero voltage switching;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1517115
