Cmos circuit overvoltage protection

Details Cmos circuit overvoltage protection Cmos circuit overvoltage protection

H - Electricity

02

H

328/198

H02H 9/04 (2006.01) H01L 27/02 (2006.01) H03K 3/356 (2006.01) H03K 17/0814 (2006.01)

Patent

CA 1215142

- 10 - CMOS CIRCUIT OVERVOLTAGE PROTECTION Abstract The novel circuit in accordance with the present invention uses vertical bipolar transistors to carry the overvoltage surge current. The transistors are controlled by a voltage sensing and driving arrangement which includes means for latching the current-carry bipolar transistors in their conducting state during the cause of the surge. The structure of the vertical bipolar transistors is such that they can be readily incorporated on a CMOS integrated circuit. The transistors of the sensing, latching and driving circuits can then conveniently be in the form of MOW devices and thereby can be provided with better accuracy and in a reduced circuit area.

480392

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