Telephonic communications – Substation or terminal circuitry – Impedance matching or line equalizing
Patent
1984-12-26
1987-04-28
Rubinson, Gene Z.
Telephonic communications
Substation or terminal circuitry
Impedance matching or line equalizing
330 69, 330151, 330258, 330260, 379399, H04M 176
Patent
active
046619780
ABSTRACT:
A subscriber line interface circuit described wherein a pair of line terminals are connected to a subscriber loop and a pair of output terminals are connected to a telecommunication exchange. A first amplifier is provided having a first pair of input terminals coupled to the line terminals and a second pair of input terminals. The first amplifier has a unity gain over a path from the input terminals of the first pair to said output terminals and a gain K over a path from the terminals of the second pair to said output terminals. A pair of reference resistors are cross-coupled from said output terminals to the line terminals, each of the reference resistors having a resistance Ro. A second amplifier is connected from the line terminals to the terminals of the second pair, the second amplifier having a transfer function -Ro/K.multidot.Zt, where Zt is an impedance to be synthesized across the line terminals.
REFERENCES:
patent: 4203009 (1980-05-01), Tattersall
patent: 4387273 (1983-06-01), Chea, Jr.
patent: 4476350 (1984-10-01), Aull et al.
NEC Corporation
Rubinson Gene Z.
Vaas R.
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