Low-noise feedback cancellation filter for enhanced...

Details Low-noise feedback cancellation filter for enhanced... Low-noise feedback cancellation filter for enhanced...

2007-02-20

2007-02-20

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Cable systems and components

C375S258000, C375S216000, C375S217000, C375S219000

Reexamination Certificate

active

10286545

ABSTRACT:
A circuit is connected between a module and a pair of wires. The circuit includes a first connection line, a second connection line, radio frequency termination circuitry, a first transformer, a second transformer, a tapped inductance and a feedback cancellation filter. The first connection line is for connection to a first wire in the pair of wires. The second connection line is for connection to a second wire in the pair of wires. The radio frequency termination circuitry is connected between the first connection line and the second connection line. The first transformer has a first inductance and a second inductance. A first end of the first inductance is coupled to the first connection line. A first end of the second inductance is coupled to the second connection line. The second transformer includes a first inductance and a second inductance. The first inductance of the second transformer is coupled between a second end of the first inductance of the first transformer and a second end of the second inductance of the first transformer. The second inductance of the second transformer includes a tap line. The feedback cancellation filter is coupled to the second transformer, the first connection line and the second connection line.

REFERENCES:
patent: 3747028 (1973-07-01), Pennypacker
patent: 4189681 (1980-02-01), Lawson et al.
patent: 4614914 (1986-09-01), Hofer
patent: 4621241 (1986-11-01), Kiser
patent: 5774505 (1998-06-01), Baugh
patent: 5978690 (1999-11-01), Das et al.
patent: 5994998 (1999-11-01), Fisher et al.

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