Pad cell with multiple signal paths

Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point

Reexamination Certificate

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Reexamination Certificate

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10824850

ABSTRACT:
An integrated circuit is described including internal circuitry and having at least one external connection. A pad cell is electrically interposed between the external connection and the internal circuitry, the pad cell comprising a first group of components adapted to protect the internal circuitry from transients at the external connection and providing, during normal operating conditions of the integrated circuit, a first signal path to the internal circuitry, and a second group of components providing a second signal path from the external connection to the internal circuitry. The second signal path is non-operable during the normal operating conditions but on application of a predefined voltage at the external connection becomes operable.

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Razavi, B., Chap 18—Design of Analog CMOS Integrated Circuits, McGraw Hill, International Edition 2001, pp. 657-660.

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