Ken Kundert
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SpectreRF is simply part of Spectre. To find out Spectre's version, use 'spectre -h', or 'spectre -V' or 'spectre -W'.
Many people cause problems for themselves by using absurdly tight tolerance settings. If you are using absurdly tight tolerance settings, stop. If you are not, and PSS does not converge despite using a reasonable tstab, then your circuit might not be periodic.
If it is a driven circuit, use strobing at the clock frequency and perform a long transient analysis. If the strobed waveforms become constant valued, then your circuit is periodic and SpectreRF should work. Use the settling time to determine a reasonable value of tstab. If they do not become constant valued, then you need to determine why your circuit is not periodic. I recommend that you observe the power supply currents when running this test.
-Ken
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