Subscriber circuit link interface for an automatic telephone exc

Details Subscriber circuit link interface for an automatic telephone exc Subscriber circuit link interface for an automatic telephone exc

1985-05-20

1988-06-21

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379405, H04M 1900

Patent

active

047529520

ABSTRACT:
The interface of the invention comprises a power supply circuit (16) which is a symmetrical amplifier circuit, and a hybrid circuit (29) controlling the power supply circuit in DC and in AC. The hybrid includes a phase shifter circuit (44, 45) simulating long lines.
Application: private telephony.

REFERENCES:
patent: 4039766 (1977-08-01), Picandet
patent: 4292479 (1981-09-01), Chataignon et al.
patent: 4310733 (1982-01-01), Schoofs
patent: 4476350 (1984-10-01), Aull et al.
patent: 4514595 (1985-04-01), Rosenbaum
patent: 4567331 (1986-01-01), Martin
Analysis and Design of Analog Integrated Circuits, P. R. Gray et al., John Wiley & Sons, New York, 1977, pp. 150-155.
"One Chip Closes in on SLIC Functions, L. Brown et al., Electronic Design, Sep. 27, 1980, pp. 85-91.

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