Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2007-02-27
2007-02-27
Cho, James (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S083000
Reexamination Certificate
active
11385234
ABSTRACT:
Multi-mode signal drivers with a single output circuit that may be controlled using a mode select input and that may include a common mode (CM) voltage compensation mechanism are described. In a first exemplary implementation, a multi-mode output driver is adapted to drive signals from a single output circuit according to at least two modes, such as a current mode logic (CML) signaling mode and a low voltage differential signaling (LVDS) mode. In a second exemplary implementation, a circuit comprises a quasi-LVDS output driver in which a differential amplifier circuit is connected in series with an adjustable resistive element and a programmable current source. In a third exemplary implementation, a CM voltage of an output driver circuit changes with changes to a programmable bias current. To compensate, a feedback mechanism provides a compensation signal to a variable resistive element of the output driver circuit to maintain a desired CM voltage.
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Microprocessor and Microcomputer Standards Committee of the IEEE Computer Society, “IEEE Standard for Low-Voltage Differential Signals (LVDS) for Scalable Coherent Interface (SCI),” IEEE Std 1596.3-1996, pp. i-v and 1-30, no month.
Daly Barry W.
Frans Yohan U.
Nguyen Nhat M.
Wang Yueyong
Cho James
Morgan & Lewis & Bockius, LLP
Rambus Inc.
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