Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2006-06-13
2006-06-13
Cho, James H. (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S068000
Reexamination Certificate
active
07061273
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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Boni, et al.; “LVDS I/O Interface for Gb/s-per-Pin Operation in 0.35-um CMOS”; IEEE Journal of Solid-State Circuiits, vol. 36, No. 4, Apr. 2001; pp. 706-711.
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.
Daly Barry W.
Frans Yohan U.
Nguyen Nhat M.
Wang Yueyong
Cho James H.
Rambus Inc.
Shemwell MaHamedi LLP
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