摘要
文章提出了一种新的调制技术,以提高数字脉冲宽度调制器(PWM)的电源纹波抑制。这种调制技术的特点是使用两个反馈点(开关节点和输出点),以使在相对低的开关频率下实现高增益和高带宽。由此能够得到高环路增益,提高电源纹波抑制比。通过系统仿真及实验测试证实,与理论分析基本一致。此技术可用于高性能要求的直流电源变换器及高保真音频功率放大器。
This paper proposes a new modulation technique to improve power supply ripple rejection for the digital pulse width modulator （PWM）. The feature of this modulation technique is using two feedback points （switching node and output point） to achieve high gain and high bandwidth at a relatively low switching frequency, with which a high loop gain and improve power supply ripple rejection ratio can be obtained. System simulation and experimental tests demonstrate the consistency with the theoretical analysis. This technique can be used for high-fidelity audio power amplifiers and DC power converters with high-performance requirements.
出处
《电子技术（上海）》
2015年第5期23-29,共7页
Electronic Technology
