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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%)
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