Line feed circuit

Details Line feed circuit Line feed circuit

1978-12-29

1980-03-18

Robinson, Thomas A.

179 18FA, H04M 302

Patent

active

041940911

ABSTRACT:
A line feed circuit for a telephone subscriber loop is disclosed which can be used to supply constant current to the subscriber loop. An operational amplifier, operating in its direct current mode, is used to maintain the current constant. The same operational amplifier, operating in its alternating current mode, magnifies the value of a capacitance bypassing the line feed circuit. In this way the alternating current impedance of the line feed circuit is maintained at a very low level.

REFERENCES:
patent: 3223781 (1965-12-01), Hestad
patent: 4007335 (1977-02-01), Hetherington et al.
patent: 4099032 (1978-07-01), Roge et al.
patent: 4135062 (1979-01-01), Ferrieu

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