Apparatus for transmitting and/or receiving balanced signals on

Details Apparatus for transmitting and/or receiving balanced signals on Apparatus for transmitting and/or receiving balanced signals on

1982-02-18

1984-11-27

Rubinson, Gene Z.

179170R, H04B 158

Patent

active

044852770

ABSTRACT:
A transformerless hybrid circuit arrangement for a subscriber line interface circuit of a telecommunications exchange is disclosed. A preferred embodiment of the hybrid arrangement comprises a first and a second operational amplifier plus a differential amplifier connected together in the following manner: The non-inverting input of the first operational amplifier is connected to a first reference voltage and the output of this amplifier is connected (1) via a first resistor to one wire of the two-wire subscriber line, and (2) via a third resistor to the inverting input of the amplifier. The non-inverting input of the second operational amplifier is connected to a second reference voltage and to the receiving branch of the four-wire line of the telecommunications exchange. The output of this second operational amplifier is connected via a second resistor to the other wire of the two-wire subscriber line, via a fourth resistor to the inverting input thereof and via a fifth resistor to the inverting input of the first operational amplifier. Each of the two inputs of the differential amplifier are connected, via respective resistors, to one wire of the two-wire subscriber line and to the output of that operational amplifier which is connected to the other wire of the two-wire subscriber line. The output of the differential amplifier is connected to the transmitting branch of the four-wire line of the exchange.

REFERENCES:
patent: 3855430 (1974-12-01), Collardelle et al.
patent: 3973088 (1976-08-01), Ota et al.
patent: 4034166 (1977-07-01), Hollis
patent: 4358643 (1982-11-01), Levy
patent: 4380690 (1983-04-01), Matsufuji et al.
M. Patten; "Electronic Hybrid Telephone Line Pack"; IBM Technical Disclosure Bulletin; vol. 16, No. 4; Sep. 1973; pp. 1173-1174.
"Subscriber Line Interface Circuits"; ITT North Microsystems Division Technical Brochure; received Jul. 1979; p. 1.
"Subscriber Loop Interface Circuit"; Motorola Linear Interface Integrated Circuits Brochure; Copyright 1979; pp. 6-30 to 6-37.
IBM Technical Disclosure Bulletin, vol. 16, No. 2, Jul. 1973, "Balanced Electronic Hybrid Circuits", pp. 495 and 496.

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