CLASS-E TUNED AMPLIFIERS IN POWER AMPLITUDE MODULATORS

被引：0
|
作者：
Modzelewski, Juliusz [1 ]
Mikolajewski, Miroslaw [1 ]
机构：
[1] Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland
来源：
2008 MIKON CONFERENCE PROCEEDINGS, VOLS 1 AND 2 | 2008年
关键词：
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A h.f. power amplifier used in drain amplitude modulator must have a linear static modulation characteristic Le. linear dependence of amplifier h.f. output voltage vs. its supply voltage. This condition essential for obtaining low-level envelope distortions is theoretically met by a Class-E amplifier. In this paper the influence of non-linear output capacitance of the transistor in the Class-E amplifier on its static modulation characteristic is analyzed Simulations with PSPICE of Class-E amplifiers operating at frequencies 0.5MHz, 5MHz and 7MHz have proven that distortions of the amplifier static modulation characteristic caused by non-linear output capacitance of the amplifier transistor are only slight. However, the decrease of power efficiency of the class E amplifier resulting from non-linearity of transistor output capacitance can be significant even by 40%.
引用
收藏
页码：145 / 148
页数：4
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