Termination circuit for computer parallel data port

Details Termination circuit for computer parallel data port Termination circuit for computer parallel data port

1995-03-13

1997-11-11

Lee, Benny

Wave transmission lines and networks

Dissipating terminations for long lines

Fluid-cooling

326 30, H01P 124

Patent

active

056868723

ABSTRACT:
Reflections and cross talk in a high-speed, bidirectional transmission line are minimized by terminating the transmission line with a network including a "serial" resistor connected in series between an end of the transmission line and a parallel (e.g. data) port, a "pull-up" resistor connected to the transmission line side of the serial resistor, and a capacitor connected between the parallel port side of the serial resistor and ground. Optionally, a diode is connected between the pull-up resistor and a bias potential. A variety of exemplary values for these components (i.e., serial resistor, pull-up resistor, capacitor) are discussed, in the context of particular signals. Preferably, the capacitor and the resistors are positioned as close as possible to the connector.

REFERENCES:
patent: 4859877 (1989-08-01), Cooperman et al.
patent: 5120909 (1992-06-01), Kutz et al.
patent: 5208562 (1993-05-01), Schirm, IV
patent: 5239559 (1993-08-01), Brach et al.
Gopalan et al., "An Optimized Active SCSI Termination Technique"; Silicon Valley Personal Computer Design Conference (SVPC '93) Proceedings, vol. II, Jul. 20-22, 1993, Santa Clara, CA; ed. Kenneth Majithia, Maple Press, pp. 339-344.
Cases et al., "Multifunctional Diode Terminator Network"; IBM Technical Disclosure Bulletin, vol. 21, No. 5, Oct. 1978, pp. 1881-1882.

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