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TPS74401: Datasheet中的Noise Spectral Density曲线图是如何测得?

Part Number: TPS74401

hello,如下图,XC74401 Datasheet中提供的Noise Spectral Density噪声谱密度曲线是如何测得的呢?能否提供具体的测试方法与相应测试设备型号。

我司使用此芯片前需要复测此结果后才能使用,谢谢。