Low voltage differential signaling with output differential...

Details Low voltage differential signaling with output differential... Low voltage differential signaling with output differential...

2007-06-26

2007-06-26

Tran, Anh Q. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

C326S032000, C326S068000, C327S539000, C327S540000

Reexamination Certificate

active

11238780

ABSTRACT:
Apparatus and method for providing reference voltages for differential signaling with tracking of output differential voltage relative to output offset voltage are described. A swing reference voltage, an offset reference voltage, a swing feedback voltage, and an offset feedback voltage are obtained. Differences between pairs of these voltages are differentially amplified to produce first and second bias voltages. Pull-up and pull-down voltages are driven partially responsive to the first bias voltage and the second bias voltage to provide first and second control voltages. The first control voltage may be provided to a first resistance for the driving of the first pull-up and pull-down voltages. The second control voltage may be provided to a second resistance for the driving of the second pull-up and pull-down voltages. The first control voltage and the second control voltage may be provided to a third resistance.

REFERENCES:
patent: 5774013 (1998-06-01), Groe
patent: 7127368 (2006-10-01), Choi
U.S. Appl. No. 11/089,848, filed Mar. 24, 2005, Zhou et al.

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