TPS7A8300: Question of noise ripple measurement

Hi Jimmy,

A scope will not be able to measure output voltage noise. We use a spectrum analyzer for the output noise measurements. If voltage ripple is present on the LDO input, the ripple is attenuated by the LDO and the output ripple will be very small due to the PSRR of the LDO. Output voltage ripple will also be too small for a scope. We use a vector network analyzer (VNA) to measure the PSRR performance of the LDO.

Here is an app note on measuring output noise:  https://www.ti.com/lit/wp/slyy076/slyy076.pdf

Here is an app note on measuring PSRR:  https://www.ti.com/lit/an/slaa414a/slaa414a.pdf