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发表于 2020-2-26 23:07:50
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I guess this diode is used to reduce the holding voltage or under shoot voltage on the PAD. Suppose if there is an NS-mode ESD event, typically the ground is separated from a shared substrate/global ground, thus, the holding voltage can be as high as the one held by the two diodes in series, this diode bypasses the two diodes. (one from the ground(in picture) to substrate plus the other from substrate to the drain(parasitic)).
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