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请教LDO的PSRR怎么测试出来的?谢谢!



请教LDO的PSRR怎么测试出来的?谢谢!

我看资料有的是PSRR=20*log[vout(ripple)/vin(ripple)],

有的又是PSRR=20*log[vin(ripple)/vout(ripple)],

还有提到一个频率,不同频率下。

这个频率是怎么产生的?用什么来产生?

谢谢大家!