Transmission networks for telephone system

Details Transmission networks for telephone system Transmission networks for telephone system

1975-11-25

1977-07-05

Claffy, Kathleen H.

H04B 158

Patent

active

040341666

ABSTRACT:
Intended to give cost, size and possibly performance advantage over a conventional hybrid transformer arrangement, by using operational amplifiers with semiconductors. Typically the input and output at the 4-wire side are each unbalanced, and the 4-wire side input path involves a line driver comprising driver amplifiers for each conductor of the balanced 2-wire line. The driver amplifiers are operative over a resistor bridge network extending to the 2-wire line. Another pair of series-connected operational amplifiers constitute a common mode rejection receiver between the 2-wire line and the 4-wire output and are controlled from diagonals of said bridge. It is necessary to provide for cancellation of the coupling between the 4-wire incoming and outgoing paths, and this is effected by using a signal from the output of the inverting amplifier for disablement of the receiver.

REFERENCES:
patent: 3973089 (1976-08-01), Puckette

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