模拟电路后仿仿真Step越跑越慢，不动了，怎么解决
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跑一个模拟电路的后仿仿真，tran仿真。
可是仿真时 仿真的 step越来越小，都到几 fs了，仿真时间根本就不动了，不知道是什么问题，怎么解决?
下面是仿真log文件的一部分：
....
cmin = 0 F
gmin = 1 pS
maxrsd = 0 Ohm
mos_method = s
mos_vres = 50 mV
tran: time = 108.7 ns (1.09 %), step = 3.142 fs (31.4 n%)
Warning from spectre at time = 108.733 ns during transient analysis `tran'.
Convergence difficulties resulted in error requirements being unsatisfied.
tran: time = 108.7 ns (1.09 %), step = 1.221 ps (12.2 u%)
Warning from spectre at time = 108.837 ns during transient analysis `tran'.
Convergence difficulties resulted in error requirements being unsatisfied.
tran: time = 108.8 ns (1.09 %), step = 104.2 ps (1.04 m%)
tran: time = 108.8 ns (1.09 %), step = 794.9 as (7.95 n%)
....
可是仿真时 仿真的 step越来越小，都到几 fs了，仿真时间根本就不动了，不知道是什么问题，怎么解决?
下面是仿真log文件的一部分：
....
cmin = 0 F
gmin = 1 pS
maxrsd = 0 Ohm
mos_method = s
mos_vres = 50 mV
tran: time = 108.7 ns (1.09 %), step = 3.142 fs (31.4 n%)
Warning from spectre at time = 108.733 ns during transient analysis `tran'.
Convergence difficulties resulted in error requirements being unsatisfied.
tran: time = 108.7 ns (1.09 %), step = 1.221 ps (12.2 u%)
Warning from spectre at time = 108.837 ns during transient analysis `tran'.
Convergence difficulties resulted in error requirements being unsatisfied.
tran: time = 108.8 ns (1.09 %), step = 104.2 ps (1.04 m%)
tran: time = 108.8 ns (1.09 %), step = 794.9 as (7.95 n%)
....
有人说是内存的问题，内存不够。但是没有说解决方法。不知道有谁碰到过类似的问题没有，怎么解决呢
是不收敛的问题。
在那个时间点上有大信号阶跃响应。
解决办法的话，我一般是修改absi 和 reli 这两个参数。
非常感谢。先去试一下
是不是震荡了
估计是不收敛，如果电路当中有太多floating点的话可能会引起这种现象，或者就按3楼的方法，调一下spectre的精度，retol 等等，这样可能就会解决了。
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