Transformerless hybrid circuits

Details Transformerless hybrid circuits Transformerless hybrid circuits

H - Electricity

04

M

379/32, 379/66

H04M 7/00 (2006.01) H04B 1/58 (2006.01)

Patent

CA 1181186

ABSTRACT The two wires of a symmetrical two-wire line are connected via two halves of a terminal line resistor to respective terminals of a relatively low impedance symmetrical input arm of a return path such as a four-wire line, are each connected via a relatively high value resistor to respective inputs of an operational amplifier which leads to the go path, the inputs of the operational amplifier also being connected cross-wise via respective resistors of a value double that of the terminals of the input arm. A thres- hold value element comprising a transistor may monitor the output voltage of the operational amplifier and change a d.c. reference voltage so that the output signals of two operational amplifiers located in the go path are sub- stantially mutually equal. Other circuit components may serve to determine current asymmetry and to monitor loop closure.

374518

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