Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1998-01-09
2000-04-25
Zweizig, Jeffrey
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
326 30, H03B 100
Patent
active
060548819
ABSTRACT:
An input/output (I/O) buffer is presented which selectively provides resistive termination for a transmission line coupled to an input/output node. The I/O buffer includes the input/output node, a first output driver stage, a second output driver stage, a differential amplifier, and an input termination stage. The first output driver stage is enabled when resistive termination of the transmission line is not required (e.g., when an older bus standard is to be supported). The second output driver stage is enabled when resistive termination of the transmission line is required (e.g., when a higher performance bus is to be supported). The differential amplifier produces a logic high input signal when a voltage driven upon the input/output node by the transmission line is greater than a reference voltage, and produces a logic low input signal at the output terminal when the voltage driven upon the input/output node by the transmission line is less than the reference voltage. In one embodiment, the input termination stage includes a termination node, a resistive element coupled between the input/output node and the termination node, and a time delay unit. The time delay unit receives the input signal produced by the differential amplifier and produces a time-delayed input signal after a predetermined time delay has elapsed. The termination node is selectively coupled to either the power supply potential or the ground potential dependent upon the time-delayed input signal produced by the time delay unit.
REFERENCES:
patent: 4408135 (1983-10-01), Yuyama et al.
patent: 4604731 (1986-08-01), Konishi
patent: 4859877 (1989-08-01), Cooperman et al.
patent: 4952818 (1990-08-01), Erdelyi et al.
patent: 5095230 (1992-03-01), Takai et al.
patent: 5220216 (1993-06-01), Woo
patent: 5319258 (1994-06-01), Ruetz
patent: 5329190 (1994-07-01), Igarashi et al.
patent: 5387824 (1995-02-01), Michelsen
patent: 5568060 (1996-10-01), Bartholomay et al.
patent: 5652528 (1997-07-01), Kimura et al.
patent: 5726583 (1998-03-01), Kaplinsky
patent: 5731711 (1998-03-01), Gabara
patent: 5852579 (1998-12-01), Arcoleo et al.
Advanced Micro Devices , Inc.
Daffer Kevin L.
Zweizig Jeffrey
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