Termination circuits and methods therefor

Details Termination circuits and methods therefor Termination circuits and methods therefor

1998-05-07

1999-12-28

Tokar, Michael

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

326 56, 326 83, 326 86, H03K 1716, H03K 19003

Patent

active

060086653

ABSTRACT:
An active termination circuit for terminating a transmission line in an electronic device. The active termination circuit is configured to clamp a voltage level on the transmission line to one of a first reference voltage level and a second reference voltage level. The active termination circuit includes a first clamping transistor coupled to a transmission line terminal and a first terminal. The transmission line terminal is configured to be coupled to the transmission line in the electronic device. The first terminal is configured to be coupled to the first reference voltage level in the electronic device. There is included a second clamping transistor coupled to the transmission line terminal and a second terminal. The second terminal is configured to be coupled to the second reference voltage level in the electronic device. There is also included a first threshold reference device coupled to the first clamping transistor. The first threshold reference device being configured to maintain a base of the first clamping transistor at about V.sub.BE lower than the second reference voltage level. There is further included a second threshold reference device coupled to the second clamping transistor, the second threshold reference device being configured to maintain a base of the second clamping transistor at about V.sub.BE higher than the first reference voltage level.

REFERENCES:
patent: 3581244 (1971-05-01), Smith
patent: 3720878 (1973-03-01), Rosemberry
patent: 3828281 (1974-08-01), Chambers, Jr.
patent: 3832575 (1974-08-01), Dasgupta et al.
patent: 3937988 (1976-02-01), DeClue et al.
patent: 4156173 (1979-05-01), Taralp
patent: 4298846 (1981-11-01), Hirano et al.
patent: 4345171 (1982-08-01), Harris, Jr.
patent: 4414480 (1983-11-01), Zasio
patent: 4486723 (1984-12-01), Lysobey
patent: 4691128 (1987-09-01), Friihauf
patent: 4766334 (1988-08-01), Warner
patent: 4798982 (1989-01-01), Voorman
patent: 4859877 (1989-08-01), Cooperman et al.
patent: 4943739 (1990-07-01), Slaughter
patent: 4996504 (1991-02-01), Huber et al.
patent: 5021684 (1991-06-01), Ahuja et al.
patent: 5034629 (1991-07-01), Kinugasa et al.
patent: 5107144 (1992-04-01), Hirayama
patent: 5111080 (1992-05-01), Mizukami et al.
patent: 5179299 (1993-01-01), Tipon
patent: 5206544 (1993-04-01), Chen et al.
patent: 5214320 (1993-05-01), Truong
patent: 5311071 (1994-05-01), Ueda
patent: 5422608 (1995-06-01), Leversque
patent: 5448182 (1995-09-01), Countryman et al.
patent: 5457406 (1995-10-01), Takada et al.
patent: 5457407 (1995-10-01), Shu et al.
patent: 5459440 (1995-10-01), Claridge et al.
patent: 5461265 (1995-10-01), Kunihisa et al.
patent: 5463326 (1995-10-01), Raje
patent: 5467455 (1995-11-01), Gay et al.
patent: 5485107 (1996-01-01), Lacey et al.
patent: 5510727 (1996-04-01), Culmer et al.
patent: 5514979 (1996-05-01), Collins et al.
patent: 5514983 (1996-05-01), Yoshino
patent: 5528190 (1996-06-01), Honnigford
patent: 5530377 (1996-06-01), Walls
patent: 5532616 (1996-07-01), Keeney
patent: 5534811 (1996-07-01), Gist et al.
patent: 5546016 (1996-08-01), Allen
patent: 5546017 (1996-08-01), Vitunic
patent: 5559447 (1996-09-01), Rees
patent: 5559448 (1996-09-01), Koenig
patent: 5563525 (1996-10-01), Lee
patent: 5578939 (1996-11-01), Beers et al.
patent: 5581197 (1996-12-01), Motley et al.
patent: 5585740 (1996-12-01), Tipon
patent: 5585741 (1996-12-01), Jordan
patent: 5604450 (1997-02-01), Borkar et al.
patent: 5635852 (1997-06-01), Wallace
patent: 5760601 (1998-06-01), Frankeny

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