Electronic subscriber junctor

Details Electronic subscriber junctor Electronic subscriber junctor

1980-06-16

1982-10-26

Brown, Thomas W.

179 16F, 179170NC, H04M 176, H04M 1900

Patent

active

043563546

ABSTRACT:
For feeding a telephone subscriber's line without the use of a transformer, this junctor comprises a symmetrical amplifier whose two input terminals receive two negative feedback voltages derived from a weighted sum current of the currents entering and leaving the subscriber's line. To form this weighted sum current, use is made of a current mirror whose summing and input terminals are connected respectively to one terminal of the supply source and to the corresponding supply terminal of the amplifier, and a voltage divider connected between the output of the current mirror and the other terminal of the supply source and whose intermediate terminal is connected to the other supply terminal of the amplifier. The voltage ratio of the voltage divider is equal to the current ratio of the current mirror. The voltage at the ends of the voltage divider is applied to a voltage follower which is regulated to provide the weighted sum current with the desired amplitude.

REFERENCES:
patent: 4181824 (1980-01-01), Seidel

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