Modem apparatus

Details Modem apparatus Modem apparatus

2005-04-14

2011-11-22

Brown, Vernal (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C340S012320, C340S288000

Reexamination Certificate

active

08063768

ABSTRACT:
Provided is a modem apparatus of power line communication using a power line as a transmission path. The modem apparatus includes: an amplifier for amplifying communication signals and outputting a differential signal obtained from a pair of output signals having a phase difference of 180 degrees therebetween; a signal transformer for applying the amplified communication signals to the power lines; and a balance circuit connected at the primary side of the signal transformer, for enhancing circuit balancing. The balance circuit is constituted by a variable element capable of changing an element value, and there is provided a common mode detecting circuit that detects a common mode current flowing through the secondary side of the signal transformer and that changes the element value of the variable element of the balance circuit such that the detected common mode current becomes small.

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patent: 2005-5881 (2005-01-01), None
patent: 2005-005922 (2005-01-01), None
patent: 2005-176038 (2005-06-01), None
patent: 2005-311408 (2005-11-01), None

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