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关于同步buck的波特图

Other Parts Discussed in Thread: SFRA

我用计算出来的同步buck的传递函数绘制出的波特图如下 参考《开关变换器动态性能》,而使用ti的SFRA扫出来的波特图如下: ,请问为什么会有这么大的差异呢?SFRA出来的为什么相位会有一个360°的突变呢