georgejor
Junior Member
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Posts: 15
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Dear Edward, Thanks for your opinion. I understand that gnd and vss should be the min potential, but i think it is a problem of NOISE when the substrate ground(Vss) and circuit ground(gnd) are connected "on chip". So, in some standard cell, there are two type, one is vss connects to gnd directly, another is vss and gnd separately.
Regards, Raymond
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