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发表于 2023-12-2 01:15:43
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The picture is not very clear to me.
(1) If the gate is connected to i/o (because there is a resistor before the grounded gate device), the grounded gate device may work as "secondary ESD device" for CDM. Its body diode provide a ESD protection for diff-pair.
(2) Another idea is to use it for reliability to prevent PID (Plasma induced damage). If the path to gate is long, to improve accuracy and prevent PID, the P/N junction may provide a discharge path for the charge induced by PID |
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