Circuit arrangement for preventing gain from responding to frequ

Details Circuit arrangement for preventing gain from responding to frequ Circuit arrangement for preventing gain from responding to frequ

1989-06-23

1991-08-06

Dwyer, James L.

Telephonic communications

Line equalization or impedance matching

379345, 379402, 330259, H04M 704

Patent

active

050383752

ABSTRACT:
By the use of a feedback arrangement, deleterious circuit effects of an isolation transformer in a terminal device for a telephone line can be eliminated. By this arrangement, a smaller, cheaper transformer may be used. A terminal device employing such arrangement can present a balanced termination to a telephone line, exhibit a known and controlled impedance to that line and provide for signals to be coupled to and from that line.

REFERENCES:
patent: 4156859 (1979-05-01), Forward et al.
patent: 4253070 (1981-02-01), Carlsen, II
patent: 4357495 (1982-11-01), Sweet et al.
patent: 4503289 (1985-03-01), Spires

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