Electronic hybrid

Details Electronic hybrid Electronic hybrid

1978-10-10

1979-11-13

Brown, Thomas W.

179170D, H04B 158

Patent

active

041744705

ABSTRACT:
A class of electronic hybrids is disclosed in which the line balancing impedance is made frequency-sensitive in order to better match the frequency characteristic of the connected line and is made voltage-controlled in order that a single network can be used to match a variety of different gauges of telephone cable pairs. The matching impedances are synthesized utilizing RC networks and the voltage control is realized with two-node Miller effect impedance multiplication circuits realized by long-tailed pairs for synthesizing hyperbolic tangent impedance functions under the control of a voltage.

REFERENCES:
patent: 3178521 (1965-04-01), Brown
patent: 3530260 (1970-09-01), Gaunt
patent: 3778563 (1973-12-01), Bise et al.
patent: 3855430 (1974-12-01), Colardelle et al.
patent: 3970805 (1976-07-01), Thomas
patent: 3973089 (1976-08-01), Puckette
patent: 4004109 (1977-01-01), Boxall
patent: 4064377 (1977-12-01), Regan
patent: 4074087 (1978-02-01), Blake, Jr. et al.
S. B. Park, "Novel Active Hybrid Circuit and its Applications", Electronic Letters, vol. 11, No. 16, Aug. 7, 1975, pp. 362-363.
John R. Sergo, Jr., "DSS Quadline Circuit", International Symposium on Subscriber Loops and Services, Mar. 24, 1978, pp. 182-184.

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