仿真的时候，有的时候时间设置长了就会出现错误：
WARNING -- Pulse Period < (Rise Time + Fall Time + Pulse Width) for V_V4
ERROR -- Convergence problem in transient analysis at Time = 10.00E-06
Time step = 209.0E-18, minimum allowable step size = 1.000E-15
These devices failed to converge:
D_D1
然后还会弹出一个框：pspice runtime setting
这是怎么回事啊?
