Title :
Class DE high-efficiency tuned power amplifier
Author :
Koizumi, Hirotaka ; Suetsugu, Tadashi ; Fujii, Motoki ; Shinoda, Kokichi ; Mori, Shinsaku ; Iked, Kazunaga
Author_Institution :
Dept. of Electr. Eng., Keio Univ., Yokohama, Japan
fDate :
1/1/1996 12:00:00 AM
Abstract :
A new type of high-frequency high-efficiency tuned power amplifier is proposed, analyzed and verified experimentally. It is called a Class DE tuned power amplifier because its circuit topology is very similar to that of the conventional Class D amplifier and the operation of each switch satisfies the Class E switching conditions when the switch turns on. Class E switching conditions are achieved by providing a shunt capacitor for each switch and realizing a dead-time between the switch-on-times. These conditions take into account that the amplifier operates at higher frequency than the conventional Class D amplifier. The switch voltage stress has kept on the same level to the conventional Class D amplifier. The measured efficiency was over 96% at 1 MHz
Keywords :
HF amplifiers; nonlinear network analysis; power amplifiers; radiofrequency amplifiers; switching circuits; 1 MHz; 96 percent; HF power amplifier; class DE; class E switching conditions; high-efficiency amplifier; high-frequency amplifier; shunt capacitor; switch voltage stress; tuned power amplifier; Capacitors; Circuit topology; Frequency; High power amplifiers; Operational amplifiers; Power amplifiers; Stress; Switches; Switching circuits; Voltage;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
