Differential line driver employing predistortion

Details Differential line driver employing predistortion Differential line driver employing predistortion

1991-04-23

1993-04-20

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

330275, H04B 300

Patent

active

052048802

ABSTRACT:
A two terminal line driver employing predistortion is disclosed, for driving data over a lossy transmission line such as a twisted pair cable at speeds on upwards of 10 Mbit/s. The driver is designed for voltage output operation wherein fullstep and halfstep information is actively encoded into a voltage level provided for at the output terminals. The driver provides a fullstep voltage spanning the supply rails and a halfstep voltage having a selectable controlled amplitude of a predetermined value. Fat bits resulting from the biphase encoding format are predistorted by dropping the amplitude to a predetermined value, equalizing the relative power content.

REFERENCES:
patent: 4437021 (1984-03-01), Sumi et al.
patent: 4605864 (1986-08-01), Varadarajan et al.
patent: 4742309 (1988-05-01), Chu
patent: 4803485 (1989-02-01), Rypinski
patent: 4964140 (1990-10-01), Yonekura
patent: 5077756 (1991-12-01), Christopheresen

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