Low capacitance electronically controlled active bus terminator

Details Low capacitance electronically controlled active bus terminator Low capacitance electronically controlled active bus terminator

1995-02-15

1996-07-09

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

327321, H03K 1716, H03K 19003

Patent

active

055347924

ABSTRACT:
An electronically controllable low capacitance active bus line terminator achieves low output terminal capacitances by connecting emitters of switch transistors directly to the output terminals. Termination resistors are connected directly between an output of a voltage regulator circuit and collectors of the switch transistors. Emitters of optional clamp transistors can be connected to bases or collectors of the switch transistors to limit or prevent "ringing" of bus conductors connected to the output terminals if the switch transistors are turned on. The bus conductors are thereby isolated from parasitic capacitances associated with the termination resistors and the collectors of the switch transistors when they are turned off.

REFERENCES:
patent: 4748426 (1988-05-01), Stewart
patent: 4831283 (1989-05-01), Newton
patent: 4920339 (1990-04-01), Friend et al.
patent: 5166957 (1992-11-01), Lenoir
patent: 5272396 (1993-12-01), Mammano et al.
patent: 5336948 (1994-08-01), Jordan
patent: 5338979 (1994-08-01), Mammano et al.
patent: 5381034 (1995-01-01), Thrower et al.
patent: 5382841 (1995-01-01), Feldbaumer
"Push SCSI Performance to the Limit", by Paul Boulay et al., Electronic Design, May 10, 1990, pp. 85-92.

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