Saturating bipolar switch circuit for telephone dial pulsing

Details Saturating bipolar switch circuit for telephone dial pulsing Saturating bipolar switch circuit for telephone dial pulsing

1987-07-06

1989-01-24

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379362, H04M 130

Patent

active

048005851

ABSTRACT:
A digital telephone set dial pulsing circuit in which the line current switching element is a bipolar transistor. To keep such switching transistor constantly in the saturated state irrespective of the magnitude of the line current, its base is driven by a current source supplying a current linearly related to the line current. In order to prevent an excessive voltage drop in the current source, which would reduce the voltage for the remaining circuits of the telephone set, the current source is voltage-controlled by a control circuit which provides a control voltage linearly related to the line current.

REFERENCES:
patent: 4388499 (1983-06-01), Janssen
patent: 4413159 (1983-11-01), Huizinga et al.

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