请TINYHE版主帮看看我这仿真是怎么会事？

下面是我的仿真结果
1103287999.doc

Time                  V(2)              V(U1:LO)
                    0                     0 1.16531488458804e-007
               5e-010                     0 1.16531488458804e-007
5.07139897206798e-010                     0 1.16531488458804e-007
5.21419691620395e-010                     0 1.16531488458804e-007
5.49979280447587e-010                     0 1.16531488458804e-007