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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。
The article presents a new modulation technique to improve the power supply ripple rejection of digital pulse width modulator (PWM). This modulation technique is characterized by the use of two feedback points (switching nodes and output points) to achieve high gain and high bandwidth at a relatively low switching frequency. This results in high loop gain and increased supply ripple rejection. Through system simulation and experimental tests confirmed that the theoretical analysis is basically the same. This technology can be used for high performance DC power converters and high-fidelity audio power amplifiers.