Driver impedance control apparatus and system

Details Driver impedance control apparatus and system Driver impedance control apparatus and system

2008-03-04

2008-03-04

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S083000, C326S086000, C327S108000

Reexamination Certificate

active

11162531

ABSTRACT:
A driver impedance control apparatus and system for determining the impedance of at least one driver are provided. The driver impedance control apparatus includes a first reference impedance, a second reference impedance, a dummy pull-up array, a dummy pull-down array, a pull-up array control unit and a pull-down array control unit. The pull-up array control unit controls the pull-up impedance of the driver by detecting a voltage from a first voltage divide point between the first reference impedance and the dummy pull-up array. The pull-down array control unit controls the pull-down impedance of the driver by detecting a voltage from a second voltage divide point between the second reference impedance and the dummy pull-down array.

REFERENCES:
patent: 6541996 (2003-04-01), Rosefield et al.
patent: 6836170 (2004-12-01), Kitagawa et al.
patent: 7170318 (2007-01-01), Kim et al.
patent: 2003/0062920 (2003-04-01), Radhakrishnan
patent: 2004/0113652 (2004-06-01), Lundberg
patent: 2004/0239391 (2004-12-01), Culler

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