power supply noise in HSPICE

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an_82

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I want to test an analog circuit against power supply noise in HSPICE. How can I apply noise signal to VDD? (Which command, or example)
 

You'd probably want the PSRR over frequency? Add a unit ac source to your power supply (either to VDD or to GND) and run an ac (or an xf) analysis. The ac voltage at the output represents the PSRR.
 

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