Static information storage and retrieval – Associative memories – Ferroelectric cell
Reexamination Certificate
2005-03-29
2005-03-29
Tran, M. (Department: 2818)
Static information storage and retrieval
Associative memories
Ferroelectric cell
C365S207000
Reexamination Certificate
active
06873531
ABSTRACT:
A differential sensing amplifier for content addressable memory is disclosed. In the differential sensing amplifier there is a detection circuit for detecting at an input node a change in an input signal comprising, a differential amplifier having a sense node and a reference node, a means for alternating the differential amplifier between a precharge phase and a sense phase, a precharge means for providing an input signal precharge voltage to the input signal via an input device, said input device selectively coupling the sense node to the input signal upon a change in the input signal, and a reference means for providing the reference node with a reference signal that continuously tracks the input precharge voltage during the precharge phase and actively maintains the input signal precharge voltage during the sense phase. In a specifically preferred embodiment the invention provides a sensing amplifier circuit for detecting a match or mismatch search condition on a high density content addressable memory matchline that is capable of rapidly sensing the capacitive matchline, limit the matchline voltage swing sensing all matchlines simultaneously, and providing the match and mismatch result for post processing, all under relatively low dynamic power while consuming little circuit area.
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Ahmed Abdullah
Kim Jin Ki
Borden Ladner Gervais LLP
Kinsman L. Anne
MOSAID Technologies Incorporated
Tran M.
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