Pulse or digital communications – Cable systems and components – Transformer coupling
Reexamination Certificate
2005-01-07
2010-06-01
Phu, Phuong (Department: 2611)
Pulse or digital communications
Cable systems and components
Transformer coupling
C375S257000, C375S219000, C375S220000, C375S221000, C375S350000, C370S286000, C379S406100
Reexamination Certificate
active
07729429
ABSTRACT:
A communication circuit comprises a near end transmitter, and adjustable near end replication transmitter and a near end receiver. The near end transmitter is configured to generate a transmission signal and comprises a first plurality of current sources. Outputs of the first plurality of current sources are summed to generate the transmission signal. The adjustable near end replication transmitter comprises a second plurality of current sources. Outputs of the second plurality of current sources are summed to generate a replication signal in accordance with the transmission signal. The replication signal from the adjustable near end replication transmitter is subtracted from the transmission signal from the near end transmitter and a received signal from a communication channel to generate a subtraction signal. The near end receiver is configured to receive the subtraction signal.
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patent:
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