Resistive line circuit

Details Resistive line circuit Resistive line circuit

1984-07-23

1985-11-19

Rubinson, Gene Z.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

179 70, 307 15, H04M 1900

Patent

active

045544123

ABSTRACT:
Resistive battery feed circuits are normally not used because of lack of power supply noise rejection and attendant crosstalk coupling. In this circuit the opamp and surrounding circuitry insure that power supply and ground noise do not couple into the tip and ring circuits as a metallic signal and improve crosstalk attenuation. In addition, the opamp is used to split the 48 volt supply.

REFERENCES:
patent: 3458711 (1969-07-01), Calkin et al.
patent: 3581104 (1971-05-01), Thew
patent: 3646428 (1972-02-01), Torok
patent: 3649769 (1972-03-01), Pest
patent: 3993880 (1976-11-01), O'Neill
patent: 4007335 (1977-02-01), Hetherington et al.
patent: 4087647 (1978-05-01), Embree et al.
patent: 4194091 (1980-03-01), Bosik

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