Method of and circuit arrangement for terminating a line connect

Details Method of and circuit arrangement for terminating a line connect Method of and circuit arrangement for terminating a line connect

1995-12-19

1997-10-21

Hudspeth, David R.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

326 32, 326 33, 326 86, H03K 190185

Patent

active

056800606

ABSTRACT:
When high frequency signals are transmitted to an integrated circuit through a lfine, the line must have a matched terminal resistance located as closely as possible to its end. Every portion of the line without a matched terminal resistance, and each branch of the line, produces disturbing signal reflections. In modern housings of large-scale integrated circuits the terminals are only separated by 0.5 mm, and it becomes increasingly more difficult to connect a resistance as closely as possible to the terminal of the integrated circuit. According to the invention, a field effect transistor (T.sub.R), which functions as a terminal resistance, is located inside the integrated circuit. The value determined by the channel resistance is adjusted by means of a regulated control voltage, so that the effects of operating temperature, changes in the supply voltage and deviations in the integrated circuit caused by manufacturing processes have no effect on the resistance value needed for the line match.

REFERENCES:
patent: 5134311 (1992-07-01), Biber et al.
patent: 5162672 (1992-11-01), McMahan et al.
patent: 5463331 (1995-10-01), Kuo
patent: 5546016 (1996-08-01), Allen
patent: 5559447 (1996-09-01), Rees
"Terminieren von Signalleitungen" by Safferthal, Rolf. In: Elektronik 22/1990, pp. 236-254.
Semiconductor Technology, Springer Publishing Company, Berlin, Heidelberg, NY, London, Paris, Tokyo, 1986--pp. 99-101 Tietze et al.

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