Subscriber's connecting network comprising a symmetrical power a

Details Subscriber's connecting network comprising a symmetrical power a Subscriber's connecting network comprising a symmetrical power a

1980-08-06

1982-03-23

Brown, Thomas W.

179 18HB, 179 77, H04M 322, H04M 1900

Patent

active

043214304

ABSTRACT:
A subscriber's connecting network comprising a symmetrical power amplifier which is formed by two pairs of complementary transistors. Resistors having the same values are arranged in collector circuits of the transistors of the symmetrical amplifier for limiting the current in the subscriber's line. In addition, means are present for making the base voltage dependent on the collector voltage of this transistor so that a predetermined voltage is present between these two electrodes in the normal direction of operation. Finally a by-pass capacitor for the speech currents in the subscriber's line is arranged between two input terminals of the symmetrical amplifier. The invention is particularly suitable for a network in which binary signals are used for the generation of ringing signals and metering signals in the subscriber's line.

REFERENCES:
patent: 4087647 (1978-05-01), Embree et al.
patent: 4133986 (1979-01-01), Picandet et al.
patent: 4152670 (1979-05-01), Rimondini et al.

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