Systems, circuits and methods for dual transformer duplexing

摘要

A circuit for the analog correlation of a signal to remove impairments such as echo, cross talk and intersymbol interference is described. A duplexing circuit which improves echo response by providing a second transformer is described.

主权项

1. A duplexing circuit comprising:
a first resistor coupled between a first node and a second node; a second resistor coupled between the second node and a third node; a first transformer having a secondary winding coupled to a third resistor, and a primary winding coupled between the third node and a fourth node; and a second transformer having a secondary winding and a primary winding, the primary winding of the second transformer coupled between the first and fourth nodes,
wherein the duplexing circuit is coupled to a low pass filter through a third transformer, the third transformer being a high frequency transformer.