Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2008-06-24
2008-06-24
Barnie, Rexford (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
C326S082000, C326S086000
Reexamination Certificate
active
07391231
ABSTRACT:
An active terminator is configured with switches to select between terminating two lines for transmitting one differential signal pair or two single ended signals terminated in a pseudo-differential receiver. The receiver circuitry is configured with three differential comparators. One differential comparator receives both signal lines and other two differential comparators each receive one signal line and a reference voltage. The signal lines are terminated in a resistive voltage divider with electronic switches coupling the positive and ground voltages. The top and bottom nodes of the resistor divider in both terminators are cross-coupled with pass gates. In the pseudo-differential mode the pass gates are OFF and the electronic switches are ON with known resistances. In the differential mode, the electronic switches are OFF and the pass gates are ON with known resistances. The pass gate and switch resistances are sized with the resistors to insure a desired termination impedance.
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U.S. Appl. No. 11/318,110, filed Dec. 2005.
Gomez Carlos I.
Truong Bao G.
Barnie Rexford
Hammond Crystal L
International Business Machines - Corporation
Salys Casimer K.
Winstead P.C.
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