Input periodic sources can't be used in autonomous circuits

If your oscillator circuit does not contain a stimulus to start the oscillator, you must run


a transient analysis before you run this PSS analysis. From the transient analysis you save the node voltages and use them as initial conditions to start the oscillator in the PSS analysis.

With older cadence version, an impulse current can be used to stimulate the oscillator, but must be careful with new cadence version, it shows an error "periodic input signal, which is inconsistent with autonomous circuits". A quick solution is to leave the period of the impulse current source to be empty, or use a VPWL/IPWL to start the oscillations.