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芯片ISO7721的IBIS模型无法转换为LIB模型

想做含有ISO7721q1的spice模型仿真,从TI官网上下载了ISO7721q1的ibis模型(扩展名为ibs),因为ti上只有这种模型,然后我采用cadence的model editor软件的IBIS Translator功能进行转换,想把IBIS模型转换为扩展名为LIB的模型。然而,导入ibis模型时显示"ERROR(line 6)-Invalid IBIS Version(4.1). ABORTING!"。不知道该怎么办,请大神指点一二,某不胜感激。