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.
 

To clarify erikl's suggestion, the AC Source must be added in series with the power supply voltage source.
 

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