Ring-signal generation in a SLIC

Details Ring-signal generation in a SLIC Ring-signal generation in a SLIC

1997-02-28

1998-06-09

Hong, Harry S.

Telephonic communications

Subscriber line or transmission line interface

379 67, 379 88, 379 89, 379253, 379254, 379324, 379377, 379385, 379399, H04M 1100, H04M 300, H04M 100

Patent

active

057647550

ABSTRACT:
A ring generator circuit is included in a subscriber line interface circuit (SLIC) for providing a high voltage ring signal to a plurality of ringers at the same time. The ring generator circuit includes an adder and divider circuit connected to receive a DC offset and an AC reference signal from the SLIC. The adder and divider circuit outputs a fractionalized summed signal. That signal is supplied to a full-wave rectifier, which rectifies the fractionalized summed signal so that it is always a positive voltage. The rectified signal is supplied to a switch control circuit, a first amplifier and a second amplifier. The first and second amplifiers have the same gain, but with opposite signs or polarities. The outputs of the first and second amplifiers are sent to a commutating switch, which is controlled by an output of the switch control circuit. The output of the switch control circuit is used to force the commutating switch to output a ring signal that has either a same or a reversed polarity with respect to the summed signal.

REFERENCES:
patent: 4349703 (1982-09-01), Chea, Jr.
patent: 4431868 (1984-02-01), Bolus et al.
patent: 4903189 (1990-02-01), Ngo et al.
patent: 5111382 (1992-05-01), Jones et al.
patent: 5138658 (1992-08-01), Carter et al.
patent: 5461670 (1995-10-01), Consiglio et al.
Goodenough, "High-Voltage Bonded-Wafer ICs Create First SLIC to Switch the 93-V RMS Phone-Line Ring Voltage On-Chip, Eliminating PABX Relays, SLIC Ejects Relays from PABX Line Cards," 2328 Electronic Design, 42 (1994) Jul. 11, No. 14, pp. 55-56 and 58-59 and 62-64.

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