PNP driven NMOS ESD protection circuit

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control

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327310, 327327, H03K 508

Patent

active

059822171

ABSTRACT:
A novel PNP driven NMOS (PDNMOS) protection scheme is provided for advanced nonsilicide/silicide submicron CMOS processes. The emitter of a PNP transistor and the drain of protection NMOS device are connected to an I/O pad for which ESD protection is provided by the PDNMOS. The collector of the PNP transistor and the gate of the protection NMOS transistor are connected to ground through a resistor. The source of the protection NMOS transistor is grounded. The base of the PNP transistor is connected to either a capacitor or the parasitic capacitor of the integrated circuit.

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patent: 5663678 (1997-09-01), Chang

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