Hi,

while I simulate comparator, cadence shows the following error, how can I solve it?

************************************************
Transient Analysis `tran': time = (0 s -> 50 ns)
************************************************
Attempt to generate initial guess for DC solver failed.

Notice from spectre during IC analysis, during transient analysis `tran'.
   Initial condition computed for node v2 is in error by 13.6221 uV.
   Initial condition computed for node v4 is in error by 39.9432 uV.
       Further occurrences of this notice will be suppressed.

Important parameter values:
   start = 0 s
   outputstart = 0 s
   stop = 50 ns
   step = 50 ps
   maxstep = 1 ns
   ic = all
   skipdc = no
   reltol = 1e-03
   abstol(I) = 1 pA
   abstol(V) = 1 uV
   temp = 27 C
   tnom = 27 C
   tempeffects = all
   errpreset = moderate
   method = traponly
   lteratio = 3.5
   relref = sigglobal
   cmin = 0 F
   gmin = 1 pS
   maxrsd = 0 Ohm
   mos_method = s
   mos_vres = 50 mV


Warning from spectre at time = 16.1903 ps during transient analysis `tran'.
   Convergence difficulties resulted in error requirements being unsatisfied.
Warning from spectre at time = 220.516 ps during transient analysis `tran'.
   T10: Vgd has exceeded the oxide breakdown voltage of `vbox' = 1.6 V.
Warning from spectre at time = 226.188 ps during transient analysis `tran'.
   T9: Vgd has exceeded the oxide breakdown voltage of `vbox' = 1.6 V.
Warning from spectre at time = 233.647 ps during transient analysis `tran'.
   T9: The bulk-drain junction current exceeds `imelt'.  The results computed
       by Virtuoso(R) Spectre(R) are now incorrect because the junction
       current model has been linearized.
Warning from spectre at time = 234.588 ps during transient analysis `tran'.
   T9: The bulk-drain junction current exceeds `imax'.
Warning from spectre at time = 311.271 ps during transient analysis `tran'.
   Convergence difficulties resulted in error requirements being unsatisfied.
   T14: The bulk-drain junction current exceeds `imelt'.  The results computed
       by Virtuoso(R) Spectre(R) are now incorrect because the junction
       current model has been linearized.
   T14: The bulk-drain junction current exceeds `imax'.
Notice from spectre at time = 311.931 ps during transient analysis `tran'.
   T14: The bulk-drain junction leaves the linearized region.
   T14: The bulk-drain junction current no longer exceeds `imax'.