Telephone line interface with AC and DC transconductance loops

Details Telephone line interface with AC and DC transconductance loops Telephone line interface with AC and DC transconductance loops

1993-12-03

1996-03-19

Hofsass, Jeffery

Telephonic communications

Subscriber line or transmission line interface

379415, 379405, H04M 704

Patent

active

055008941

ABSTRACT:
A method and apparatus for providing a telephone line interface having selectable termination characteristics, such as impedance parameters, is provided using AC and DC transconductance loops. The present invention may be used with modem apparatus to provide regulatory compliance of line termination characteristics in multiple countries having different, even conflicting, standards or regulations. The preferred embodiment of the present invention uses a programmable switched capacitor filter to drive a transconductance driver that drives the telephone line. An AC transconductance loop controls AC transconductance characteristics, while a DC transconductance loop controls DC transconductance characteristics.

REFERENCES:
patent: 4899382 (1990-02-01), Gartner
patent: 4935960 (1990-06-01), Takato et al.
patent: 5329585 (1994-07-01), Susak et al.

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