Apparatus for ring-back constriction

Details Apparatus for ring-back constriction Apparatus for ring-back constriction

2006-12-26

2006-12-26

Tran, Sinh (Department: 2615)

Telephonic communications

Substation or terminal circuitry

C326S030000

Reexamination Certificate

active

07155005

ABSTRACT:
An apparatus for ring-back constriction is provided. The apparatus includes a comparator, a termination controller, a termination variable resistor, a constriction controller, and a constriction variable resistor. The comparator is coupled to the transmission line, for comparing the line signal with a reference voltage, and accordingly outputting a comparison signal. The termination controller is coupled to the comparator, for outputting a termination control signal to adjust the resistance of the termination variable resistor. The constriction controller is coupled to the comparator for outputting a constriction signal to adjust the resistance of the constriction variable resistor. The ring-back effect is constricted due to impedance matchtermination voltage when an undershot occurs.

REFERENCES:
patent: 6275088 (2001-08-01), Jain
patent: 6326803 (2001-12-01), Takeda
Sedra et al., Microelectronic Circuits, 1998, Oxford University Press, Fourth Edition, pp. 1049-1052.

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