摘要
F类功率放大器实现高效率的基本原理,是利用输出滤波器控制漏极输出的电压或电流波形。基于这一点,文中首先理论分析了在不同谐波比例下的漏极电压波形,然后利用电磁仿真软件进行验证。结果表明,仅有三次谐波和基波组合在一起时,当三次谐波和基波电压比K=0.111时,漏极电压波形最平坦;当K接近0.4时,漏极电压波形趋于方波。最后选择合适的谐波比例,设计了一款功率附加效率最大值达到88.074%的F类功率放大器。
Class-F power amplifiers employ harmonic frequency resonators to shape their drain voltage or drain current waveforms to achieve high efficiency.Based on this,drain voltage waveforms with different harmonic ratios is theoretical studied first.And then the theory is verified through an electromagnetic software simulation.If only the third harmonic is considered,the conclusions are drawn as follows：for the third harmonic and fundamental wave voltage ratio K=0.111,the drain voltage waveform is the most flat;and when K is close to 0.4,the drain voltage tends to a square wave.Finally,a class-F power amplifier with appropriate harmonic ratio is designed,with a peak power-added efficiency of 88.074%.
出处
《电子科技》
2011年第10期19-21,47,共4页
Electronic Science and Technology
