H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/12
H03H 7/42 (2006.01) H04B 1/58 (2006.01) H04M 19/00 (2006.01)
Patent
CA 1075778
HYBRID CIRCUIT Abstract of the Disclosure A direct coupled transformerless hybrid for providing signal conversion between a balanced bidirectional transmission path and a pair of unbalanced unidirectional transmission paths, for providing direct current to the bidirectional transmission path, for suppressing longitudinal mode signals supplied by the bidirectional transmission path, and for providing signal balance to suppress transmission of reflected echoes from the incoming unidirectional transmission path to the outgoing unidirectional transmission path. Of the several embodiments disclosed each includes a plurality of current mirror circuits, some of which include elements of complementary conductivity type to the elements of the remaining current mirror circuits. Each current mirror circuit has a voltage supply terminal, an input terminal, at least one output terminal, with the current of the output terminal being proportional to the current at the input terminal. The signal balance at the unidirectional transmission path side of the hybrid is automatically adjusted in accordance with the resistance, and thus the length of, the bidirectional transmission path.
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