Title :
Voltage-clamped class E amplifier with transmission-line transformer
Author :
Suetsugu, Tadashi ; Kazimierczuk, Marian
Author_Institution :
Dept. of Electron. Eng. & Comput. Sci., Fukuoka Univ., Japan
Abstract :
A high switch peak voltage is a disadvantage of the class E amplifier in some applications. A lossless voltage clamp method with a transformer and a diode has been proposed as a remedy for the high peak switch voltage. However, this circuit suffers from a large ringing due to the transformer leakage inductance, which is superimposed on the clamped voltage and partially eliminates the effect of the voltage clamping. In this paper, a switch voltage clamping using a transmission-line transformer is proposed to reduce the ringing. The proposed concept was verified with an experimental voltage-clamped class E amplifier at 4 MHz and 2.9 W.
Keywords :
HF amplifiers; circuit testing; high-frequency transformers; high-frequency transmission lines; limiters; 2.9 W; 4 MHz; circuit ringing; lossless voltage clamp method; superimposed transformer leakage inductance; switch peak voltage; switch voltage clamping; transmission-line transformer; voltage clamping effect elimination; voltage-clamped class E amplifier; Circuits; Clamps; Diodes; Frequency; Inductance; Inductors; Operational amplifiers; Radiofrequency amplifiers; Switches; Transmission lines;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1464687
