1979-08-13
1981-11-10
Konick, Bernard
179170T, H04B 158
Patent
active
043000231
ABSTRACT:
A direct coupled transformerless hybrid including a plurality of current mirror circuits for providing signal conversion between a balanced bidirectional transmission path and a pair of unbalanced unidirectional transmission paths. Means are provided for increasing the DC feed resistance in response to loop faults such as grounding of the ring terminal. This is accomplished by sourcing additional current into the ring and tip terminal termination resistors to reduce their equivalent impedance during normal operation.
REFERENCES:
patent: 3849609 (1974-11-01), Voorman
patent: 4004109 (1977-01-01), Boxall
patent: 4142075 (1979-02-01), Olschewski
patent: 4203012 (1980-05-01), Boxall
Kelley Stephen H.
Lillis William J.
Ingrassia Vincent B.
Konick Bernard
Motorola Inc.
Myers Randall P.
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