1978-10-10
1980-01-01
Konick, Bernard
179170NC, H04B 340
Patent
active
041818245
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:
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patent: 4064377 (1977-12-01), Regan
"Novel Active Hybrid Circuit and Its Applications"; Electronic Letters; Vol. 11, No. 16; Aug. 7, 1975; pp. 362-363.
"DSS Quad Line Circuit"; International Symposium on Subscriber Loops and Services; Mar. 24, 1978; pp. 182-184.
Bell Telephone Laboratories Incorporated
Konick Bernard
Myers Randall P.
Nimtz Robert O.
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