Methods and apparatus to DC couple LVDS driver to CML levels

Details Methods and apparatus to DC couple LVDS driver to CML levels Methods and apparatus to DC couple LVDS driver to CML levels

2007-12-04

2007-12-04

Chang, Daniel (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

C326S082000

Reexamination Certificate

active

11098832

ABSTRACT:
Circuitry and methods are provided for an LVDS-like transmitter that may be able to DC couple to a receiver having a CML termination scheme. Replacing the common mode voltage source of an LVDS transmitter with a resistive pulldown to ground may allow the transmitter to interface in a DC coupled fashion with a CML receiver. Further, the resistive pulldown may be programmable. This LVDS-like transmitter may be able to support a wider customer base by allowing it to DC couple to a wider range of termination voltage levels, such as CML termination voltage levels.

REFERENCES:
patent: 6731135 (2004-05-01), Brunolli
patent: 6825693 (2004-11-01), Schoenborn et al.
patent: 6864704 (2005-03-01), Wong et al.
patent: 6972588 (2005-12-01), Wong et al.
Goldie, John, “The Many Flavors of LVDS”, National Semiconductor, pp. 1-7, printed Nov. 11, 2004.
Goldie, John, “LVDS, CML, ECL-differential interfaces with odd voltages”, National Semiconductor, pp. 1-9, printed Nov. 11, 2004.

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