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LDO参数PSRR频率的问题

只了解过运放的PSRR参数,那么LDO的PSRR不太明白的是和频率什么关系?

看过TI的《Understanding power supply ripple rejection in linear regulators》这篇文档,还是没搞懂。

这个手册上的PSRR图,横轴是频率,是怎么测的?这个频率是什么频率?难道是和LDO里的误差放大器有关?

谢谢