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发表于 10-7-2008 12:24 PM
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回复 37# 大大佬 的帖子
vlsi design for digital portion, we are using asic design flow. Its has auto place and route mechanism. 根本不需要手画。。analog呢,给那些high frequency signal, 需要manual来画。。routing 长度不可以让它变成transmission line model...要不然simulation 会跑了样。。还有isolation...analog signal very sensitive to high speed signal path...就很像那些adc 的ramp voltage...and you need to properly do device matching for all sort of analog circuitry such as current mirror, differential circuit etc etc... 这也是为什么到现在mask designer还有生存空间的理由。。。 |
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