Hi,
I'm reading the article of Masashi Nogawa.
LDO noise examined in detail (ti.com)
In page 3 it says:
But in reality an error amplifier tends to have a very wide bandwidth, so the LDO device has very good power-supply ripple rejection (PSRR), which is another key performance parameter of high-performance LDOs.
Why wider bandwidth can result in higher PSRR of LDO?