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如何使用开关电源+LDO组合实现低噪声的电源

Other Parts Discussed in Thread: TPS74301

有一个芯片测试的电源需要极低的噪声,具体多少我也不知道,但是普通开关电源担心不合适,希望使用LDO再滤波一次,但是,LDO又担心效率损失,我想像下图那样连接,实现LDO的最小压差来提高效率,又想利用LDO的高PSRR来得到低噪声的纹波输出,不知道是否可行?

把负载的反馈接到SMPS电源上,LDO的FB一直接地。这样,SMPS的输出一直保持为Vo+Vldo,这样能用吗?