Adaptive hybrid circuit

Details Adaptive hybrid circuit Adaptive hybrid circuit

1975-06-25

1976-08-03

Claffy, Kathleen H.

H04B 158

Patent

active

039730891

ABSTRACT:
Improved isolation between the four-wire receive and transmit ports in a four wire-to-wire converter in a communication system is obtained by utilizing a tapped delay line network in an active hybrid circuit. The active hybrid circuit includes a first amplifier which terminates the four-wire receive channel in its characteristic impedance, amplifies the four-wire received signal, and excites a resistor network that terminates the two-wire channel in its nominal characteristic impedance. A second amplifier and a resistor circuit function as a weighted summer for nulling the received four-wire signal with the signal passing through the resistor network to obtain signal cancellation at the four-wire transmit port when the four-wire receive channel is activated. The tapped delay line network may be connected either between the first amplifier and resistor network or between the first amplifier and the received four-wire signal input of the second amplifier.

REFERENCES:
patent: 3180947 (1965-04-01), Haselton, Jr. et al.
patent: 3480742 (1969-11-01), Gaunt, Jr.
patent: 3530260 (1970-09-01), Gaunt, Jr.
patent: 3586881 (1971-06-01), Gaunt, Jr.
patent: 3700831 (1972-10-01), Aagaaro et al.
patent: 3855430 (1974-12-01), Colardelle et al.

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