Telephonic communications – Repeater – With gain or attenuation control
Patent
1989-05-17
1990-10-02
Ng, Jin F.
Telephonic communications
Repeater
With gain or attenuation control
379345, H04B 336
Patent
active
049612182
ABSTRACT:
An enhanced amplifier for interconnecting a two-wire, bidirectional cable side transmission path and a two-wire bidirectional equipment side transmission path in a communication system includes a first hybrid splitter and a second hybrid splitter. The first hybrid splitter is formed of a cable-to-equipment voltage sense amplifier, a shunt current driver, and a series current compensator for generating a first simulated terminating impedance. The second splitter is formed of an equipment-to-cable voltage sense amplifier, the shunt current driver and the series current compensator for generating a second simulated terminating impedance. Other features disclosed include automatic gain adjustment circuitry for automatically setting the gain in gain/equalizer circuits to a fixed level. Further, auto-balancing circuitry is provided for adjusting automatically and continuously both equipment and cable side balance networks.
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"Self Balancing Line Hybrid", IBM Technical Disclosure Bulletin vol. 29, No 2, Jul. 1986, pp. 584-585.
Chin Davis
Ng Jin F.
Tollgrade Communications, Inc.
Vaas Randall S.
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