H - Electricity – 04 – B
Patent
H - Electricity
04
B
333/19, 379/64
H04B 1/58 (2006.01) H04M 19/00 (2006.01)
Patent
CA 1111589
ABSTRACT OF THE DISCLOSURE A direct coupled transformerless hybrid circuit which provides signal transmission between a balanced bi- directional signal path and a pair of unidirectional signal paths including current mirrors for converting signals incoming on the bidirectional signal path to signals on the outgoing unidirectional signal path, current mirrors for converting signals on the incoming unidirectional signal path to signals outgoing on the bidirectional signal path, current mirrors for suppressing the transmission of common mode signals incoming on the bidirectional signal path to the outgoing unidirectional signal path, resistances for suppressing the transmission of signals from the incoming to the outgoing unidirectional signal path, resistances providing a hybrid impedance to normal mode signals incoming on the bidirectional signal path including impedances having one terminal connected to one side of the bidirectional signal path, current mirrors and resistances providing a direct current to said bidirec- tional signal path comprised of two components, one supplied through said impedances and the other from current controlled current sources, and circuitry for maintaining said two components of direct current in constant proportion to one another independent of the direct current resistance of the bidirectional signal path.
307351
Boxall Frank S.
Smart & Biggar
LandOfFree
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