Self-referencing modulation circuit for CMOS integrated circuit

Details Self-referencing modulation circuit for CMOS integrated circuit Self-referencing modulation circuit for CMOS integrated circuit

1996-08-20

1997-04-01

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361111, H02H 904

Patent

active

056172834

ABSTRACT:
An ESD protection device is provided which includes a self referencing modulation circuit for controlling its operation. The modulation circuit includes a diode stack coupled to a resistor and further coupled to an inverter powered by the signal pad voltage in one embodiment, or an odd plurality of series connected inverters powered by the signal pad voltage in an alternate embodiment. The inverter chain is coupled to the ESD clamp. The modulation circuit requires no reference supply voltage to operate. The ESD protection circuit shunts currents associated with ESD events away from ICs as well as clamping I/O pad voltages to acceptable levels during an ESD event.

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