Input voltage clamp for a single-supply system

Details Input voltage clamp for a single-supply system Input voltage clamp for a single-supply system

2008-09-30

2011-10-04

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S091200, C361S092000, C361S090000

Reexamination Certificate

active

08031448

ABSTRACT:
A system, apparatus and a method are described that provide a voltage clamp for a single-supply system. In particular, a negative voltage clamp prevents a negative over-voltage in a system having only a positive independent voltage source. For example, certain analog-to-digital converters and other circuits allow input signals below the negative supply, or ground in single-supply systems, either by direct sampling or using input attenuation resistors. The negative clamp allows the circuit to provide accurate negative over-voltage protection and the absence of this claim would result in over-voltage protection in positive voltage directions only.

REFERENCES:
patent: 5534811 (1996-07-01), Gist et al.
patent: 5852540 (1998-12-01), Haider
patent: 6469554 (2002-10-01), Harpham
patent: 2002/0101265 (2002-08-01), Yuan
patent: 2005/0168264 (2005-08-01), Fukami
patent: 1081859 (2000-08-01), None
patent: 1 081 859 (2001-07-01), None

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