Patent Number: 6,295,323

Title: Method and system of data transmission using differential and common mode data signaling

Abstract: A system and method for transferring digital data using differential and common mode data signaling is disclosed. A first digital data signal is differentially transmitted using two differential signal components sent over a two-wire interface and switched between several different discrete signal levels. A common mode signal is carried across the differential pair and used to transmit a second digital data signal. The data output stage uses a common mode injection circuit to inject a common mode voltage or current equally onto both components of the differential interface. The data receiver has a common mode extraction circuit connected to the differential interface which extracts the injected common mode signal. Common mode data transmission can be in the same or opposite direction as the differential data transmission. Common mode signals may be injected in several layers and across two or more differential interfaces to increase the data content per interface line and to improve accuracy.

Inventors: Gabara; Thaddeus J. (Union, NJ)

Assignee: Agere Systems Guardian Corp.

International Classification: H04L 5/00 (20060101); H04L 5/20 (20060101); H04B 003/50 ()

Expiration Date: 09/25/2018