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各位专家
我最近阅读tps7a90 Datasheet时，对第6页 figure1~figure4有点疑惑。
如下图，对于低频10Hz~100Hz之间，figure1和figure2测试结果显示这段频率内，PSRR曲线是平直的。但是figure3和figure4测试结果显示这段频率内，PSRR曲线是斜的，频率越低，PSRR越低，这是为什么？
真诚希望各位专家帮我解惑，谢谢！
