Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2001-03-20
2003-11-04
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
C327S379000, C327S389000, C326S083000, C326S086000
Reexamination Certificate
active
06642755
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bus driver for a data processing system.
2. Description of the Related Art
In a data processing system, a plurality of packages each including a semiconductor integrated circuit are inserted into a back panel. The packages share buses formed on the back panel. In this case, each of the packages has a bus driver and a bus receiver.
A prior art bus driver includes an open drain type metal oxide semiconductor (MOS, broadly, metal insulating semiconductor (MIS)). This will be explained later in detail.
However, the prior art bus driver per se does not include a noise removing circuit, so that a large ringing effect is generated in the bus. Therefore, it takes a long time to converge the ringing effect, which substantially increases the propagation delay time of signals from the bus driver to its respective bus receivers. Also, it is difficult to increase the frequency of the propagated signals.
SUMMARY OF THE INVENTION
It is an object of the present invention to reduce the ringing effect in a bus driver, thus substantially reducing the signal propagation delay time as well as increasing the frequency of the propagated signals.
According to the present invention, in a bus driver for driving a bus having first and second power supply terminals, an input terminal for receiving an input signal and an output terminal connected to the bus, a switching element is provided between the output terminal and the second power supply terminal, and the switching element is controlled by a voltage at the input terminal. A pull-up resistor is connected between the first power supply terminal and the output terminal.
REFERENCES:
patent: 4918026 (1990-04-01), Kosiak et al.
patent: 5023479 (1991-06-01), Jeffrey et al.
patent: 5066876 (1991-11-01), Fukuda et al.
patent: 5218247 (1993-06-01), Ito et al.
patent: 5638402 (1997-06-01), Osaka et al.
patent: 5821767 (1998-10-01), Osaka et al.
patent: 6211694 (2001-04-01), Kamiya
patent: 6211703 (2001-04-01), Takekuma et al.
patent: 6265912 (2001-07-01), Kamiya
patent: 57-176437 (1982-10-01), None
patent: 57-203122 (1982-12-01), None
patent: 58-78221 (1983-05-01), None
patent: 58-142418 (1983-08-01), None
patent: 58-182737 (1983-10-01), None
patent: 60-128717 (1985-07-01), None
patent: 1-163812 (1989-06-01), None
patent: 1-304518 (1989-12-01), None
patent: 3-250813 (1991-11-01), None
patent: 4-618 (1992-01-01), None
patent: 6-35582 (1994-02-01), None
patent: 7-36583 (1995-02-01), None
patent: 7-334281 (1995-12-01), None
patent: 08251000 (1996-09-01), None
patent: 8-251000 (1996-09-01), None
patent: 8-286793 (1996-11-01), None
patent: 9-121148 (1997-05-01), None
Cunningham Terry D.
NEC Corporation
Nguyen Long
Sughrue & Mion, PLLC
LandOfFree
Bus driver having noise removing circuit formed by pull-up... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bus driver having noise removing circuit formed by pull-up..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bus driver having noise removing circuit formed by pull-up... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3164293