Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2008-09-26
2010-10-26
Tan, Vibol (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
C326S083000, C326S086000
Reexamination Certificate
active
07821290
ABSTRACT:
A differential voltage mode driver and digital impedance calibration of same is provided. In one embodiment, the invention relates to a method of calibrating a differential driver circuit having a plurality of parallel driver stages, the differential driver circuit for driving a differential signal over a transmission line having an impedance, the method including determining an indication of an impedance of a plurality of parallel replica stages, wherein the plurality of parallel replica stages are replicas of the plurality of parallel driver stages, determining a number of the plurality of parallel replica stages to approximately match the measured impedance with the transmission line impedance, and activating a number of the plurality of parallel driver stages equal to the number of the plurality of parallel replica stages. In another embodiment, the invention relates to a differential voltage mode driver using at least one H-bridge driver stage.
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Hammond Crystal L
Klein O'Neill & Singh, LLP
Tan Vibol
Vitesse Semiconductor Corporation
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