电路图如下：
DAC_OUT是音频信号输入（DSP输出）；TRI_OUT是384KHZ三角波输入；
当DSP无输出时（DAC_OUT是直流信号），输出应该是占空比一定的方波。
现在测试发现，输出方波占空比偶尔会变化，请帮忙分析一下，谢谢：
在上图TP17处测试，输出方波会有抖动
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