Communications: electrical – Selective – Path selection
Reexamination Certificate
2006-12-19
2006-12-19
Zimmerman, Brian (Department: 2635)
Communications: electrical
Selective
Path selection
C340S002290, C340S014400, C340S014500, C340S014600, C340S014690, C341S026000
Reexamination Certificate
active
07151432
ABSTRACT:
Aspects of a switch matrix circuit are provided. In accordance with a circuit aspect, a plurality of switches are organized in a row and column configuration. Coupled to the plurality of switches is a current sensing circuit. The current sensing circuit includes a transistor and at least one resistor per column of the plurality of switches. Current amplified by the transistor and converted by the at least one resistor in a column is sensed as a logic level indicative of a switch status within the column for a selected row. The current sensing arrangement may also be used in an embodiment utilizing bi-directional signal control to minimize the number of I/O lines required to scan the switch matrix. The bi-directional signal scanning may also be implemented in another embodiment that senses voltage levels to determine switch closures.
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Immersion Corporation
Kilpatrick & Stockton LLP
Nguyen Nam
Zimmerman Brian
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