Title :
A 50 W LDMOS current mode 1800 MHz class-D power amplifier
Author :
Kim, Ji-Yeon ; Han, Dong-Hoon ; Kim, Jong-Heon ; Stapleton, Shawn P.
Abstract :
This paper presents a 50W current mode class-D power amplifier for the 1800 MHz frequency band using commercial LDMOS-FET. The amplifier is based on a switching mode push-pull structure which utilizes a shunt harmonic termination circuit and a 180° balun output transformer. The output termination topology is applied for minimizing power losses due to the existing parasitic capacitance of the LDMOS-FET power devices. From the measured results, a drain efficiency of 63% at 47 dBm output power was achieved.
Keywords :
MOSFET circuits; UHF power amplifiers; baluns; current-mode circuits; network topology; switched current circuits; 1800 MHz; 50 W; 63 percent; LDMOS current mode class-D power amplifiers; LDMOS-FET power amplifiers; LDMOS-FET power devices; balun output transformer; drain efficiency; output termination topology; power loss minimization; shunt harmonic termination circuit; switching mode push-pull structure; Circuits; Frequency; High power amplifiers; Impedance matching; Parasitic capacitance; Power amplifiers; Power engineering and energy; Power harmonic filters; Radiofrequency amplifiers; Zero voltage switching;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1516916
