Method and apparatus for dual purpose twisted pair interface cir

Details Method and apparatus for dual purpose twisted pair interface cir Method and apparatus for dual purpose twisted pair interface cir

1995-10-18

1998-02-03

Bocure, Tesfaldet

Pulse or digital communications

Miscellaneous

375257, 333124, 370466, H04L 2300

Patent

active

057152870

ABSTRACT:
A method and apparatus is provided allowing a dual-speed network adapter to connect to the same physical connector without the use of mechanical or electro-mechanical switches. On the transmit path, the invention uses a differential amplifier buffer (130) to selectively couple a high speed transmit paths to the network, with the differential amplifier connected to the same output impedance as one of the two driver circuits. On the receive path, the invention allows data to be received in parallel by two receiver circuits, with one circuit isolated from the other with a pair of very high input impedance emitter/followers (40, 50).

REFERENCES:
patent: 5249183 (1993-09-01), Wong et al.
patent: 5260664 (1993-11-01), Graham
patent: 5541957 (1996-07-01), Lau

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