I'm going to use TPS73233 to supply a GPS module.
The microcontroller connected to this GPS module (uart connection) is supplied from another LDO.
TPS73233 datasheet suggest to use two different gnd plane, one plane for input and one for output section, connected together on LDO gnd pin, to improve PSRR.
Which will be the 'current return path' of uart lines?
If the only conjunction point of ground will be the LDO gnd pin, 'current return path' risks to be a bit long.
Is there any trick to obtain shorter current path return? (also for higher current or higher frequency). Or this is not a real noticeable problem?