sheldon
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fchirouf,
While both PSS and transient analysis are time-domain analyses, comparing their run time is like comparing the run time of ac analysis to transient analysis. In absolute terms one may be faster, but that has no meaning since you still need to use both analysis to design circuits.
Transient analysis and periodic steady-state analysis solve different problems so it does not make sense to directly compare performance. It would be better to think of them as complementary solutions for circuit design. An analogy might be that engineers use both LaPlace transforms[transient analysis] and Fourier transforms[PSS] when designing. Both are useful tools.
If the question is when to use which analyses, then to expand on Andrew's comments:
1) PSS is only useful when the circuit has a periodic steady state, for example, if you want to characterize the distortion in an amplifier for a sinusoidal input.
2) In addition, PSS enables small-signal analysis of periodic circuits, for example, you can measure the input impedance of a switching regulator to verify that it won't oscillate when the EMI filter is attached.
3) In most other cases you would use transient analysis, for example, when simulated delay time, rise/fall time, slew rate.
4) Transient is also used for circuit verification, that is, the sign-off simulation.
Best Regards,
Sheldon
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