Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1989-02-14
1990-04-24
Ng, Jin F.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
307520, 333176, H03H 502
Patent
active
049205633
ABSTRACT:
A circuit compensating for the attenuation caused on a line by an LS series type notch filter at frequencies less than the filter cut-off frequency, with such filter connected across said line and a reference voltage, includes a first resistor (R) in series on the line, a series circuit comprising a capacitor (C1) and a second resistor (R1) connected across the line and reference voltage, the capacitor being connected on the side of a first terminal of the first resistor, and an amplifier, the input of which is connected to the connection point of a capacitor and second resistor and the output of which is connected to the second terminal of the first resistor, such amplifier having a transconductance at said lower frequencies capable of ensuring the injection of a current equal to the sum of currents deviated by the series circuit and the filter.
REFERENCES:
patent: 4078205 (1976-11-01), Van Schoiack
patent: 4383229 (1983-05-01), Jones
"Active Filters Incorporating the Voltage-to-Current Transactor," Microelectronics, vol. 8, No. 3, pp. 19-22.
Ng Jin F.
SGS-Thomson Microelectronics S.A.
Vaas Randall S.
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