Does anyone know if SpectreRF can handle its input clocks being specified from a VCD file?  I was able to run a simulation of a switched capacitor circuit correctly when my simplified clocks where using vpulse devices.  However, when I changed to drive my clocks from a VCD, thinks appeared broken, i.e. my output did not converge at the correct voltage.  I did verify the timing with a tran analysis, and there were no issues with the clocks themselves.  Also, I verified that the beat period specified for the PSS was correct.  Is this even possible with PSS?  Thanks.