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Time Domain仿真,不同时长出现截然不同的结果。

PSpice for TI ,仿真一个变形的跟随器电路。
VSIN 信号源,10KHz,VAMPL = 1V,AC= 1,Time Domain 仿真。

电路不变、自有参数不变,仅仅修改了仿真结束的时间,结果曲线大不一样,
441 uS 及以下,曲线有寄生振荡,
442 uS 及以上,曲线很纯净而且光滑。

为什么?

该接受哪个结果?