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开关电源地间干扰

Other Parts Discussed in Thread: PTH08T240W

使用TI的PTH08T240W开关电源芯片,在电路板上测试原理图中标注的a点和b点两个位置的地网络,测出如下波形,经测试发现出现的干扰是由于开关频率产生的,我该如何解决这个问题?或者将输入端的地和输出端的地使用单点连接是不是对后端的电路影响要小一些?谢谢