ldo psrr
PSRR shows how the LDO output varies in accordance with power supply noise.
You will need either HSpice or Cadence to run your simulation.
For Cadence:
Place a vdc source at the power supply net. Set ac=1 for this along with its DC value.
Run AC analysis.
Use the direct plot drop down menu (Results) and click on AC dB20
Go to your schematic and click on the LDO output.
Hit Escape and u will be able to view the PSRR waveform.
For Spice:
At the power supply include ac=1
Run .ac simulation
Since PSRR = Vsupply/Vout in dB, Set a .print command as follows:
.print ac par '(20*log10((v(vsupply))/(v(vout))))'
Hope this helps!
Regards,
svraj