CMOS analog switch with auto over-voltage turn-off

Details CMOS analog switch with auto over-voltage turn-off CMOS analog switch with auto over-voltage turn-off

2006-03-14

2006-03-14

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S056000

Reexamination Certificate

active

07012794

ABSTRACT:
An analog transfer gate that can be connected to an external line of a chip that is also connected to a digital circuit. The transfer gate includes both NMOS and PMOS transistors for passing the analog signals in both directions. A voltage sensing circuit is connected to the external line and is configured to sense a voltage that is higher than the supply voltage of the analog circuit. When this occurs, it produces a sense output signal. The sense output signal activates a protection enabling circuit that turns off the PMOS and NMOS transistors. In addition, at least one additional protection transistor is activated to avoid too high of a voltage being applied across any of the transistor junctions.

REFERENCES:
patent: 5994744 (1999-11-01), Katayama et al.
patent: 6163199 (2000-12-01), Miske et al.
patent: 6617890 (2003-09-01), Chen et al.
patent: 6700431 (2004-03-01), Fotouhi et al.
patent: 6768339 (2004-07-01), Von Thun et al.

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