【摘要】 分析了D类功放大器输出滤波器设计的必要性,并且利用巴特沃思低通滤波器的设计方法对电路参数进行优化设计;采用Filter Free软件仿真滤波器的频域特性。最终达到消除PWM信号中的开关信号和电磁干扰信号,提高效率和保真度,减小输出滤波器的体积和成本。更多还原

【Abstract】 It deems essential that output filter be taken into account when designing D class. The author recommends lowpass Butterworth filter designing method to optimize circuit parameter involved, and takes advantage of Filter Free software simulating frequency characteristics of the output filter. Filter may serve the role to eliminate switching and EMI interfere in PWM signal. Thus to improve efficiency and fidelity, lower the filter cost and component sizes.更多还原