1982-05-17
1983-12-06
Schreyer, Stafford D.
179 70, 179 23, H04M 1908
Patent
active
044195427
ABSTRACT:
The battery feed circuit of the present invention does not rely principally on balanced current generation circuitry but, instead, uses a feedback circuit to ensure the production of the required currents on the communication pair. The subject feedback circuit automatically and instantaneously compensates for longitudinal currents by precisely sensing the currents appearing on each lead of the communication pair. These sensed currents are summed to remove the balanced longitudinal component and the resultant signal represents the actual metallic current on the communication pair. This actual metallic current is subtracted from a predetermined reference current and the difference between these two signals constitutes an error signal which is amplified to provide the current drive supplied to the communication pair. The subject feedback circuit also includes compensation circuitry which is responsive to the common mode voltage appearing on the communication pair to adjust the amount of this generated current applied to each lead of the communication pair to thereby minimize the longitudinal potential appearing on the communication pair.
REFERENCES:
patent: 4004109 (1977-01-01), Boxall
patent: 4087647 (1978-05-01), Embree et al.
patent: 4203012 (1980-05-01), Boxall
patent: 4272656 (1981-06-01), Nishikawa
Paul Gray, Robert Meyer; Analysis and Design of Analog Integrated Circuit; 1977, p. 13.
Embree Milton L.
Knollman Dieter J. H.
Martin Earl O.
Bell Telephone Laboratories Incorporated
Graziano James M.
Schreyer Stafford D.
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