Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Patent
1984-11-02
1987-05-12
Rubinson, Gene Z.
Telephonic communications
Subscriber line or transmission line interface
Hybrid circuit
379395, 307494, 307567, H04M 1908
Patent
active
046655476
ABSTRACT:
A signal limiting amplifier includes interstage limiting devices to restrict the range of output voltage signals. The devices are base-emitter circuits of transistors, one of which operates in response to one polarity of signals and has its collector terminal unconnected, and the other of which operates in response to the other polarity of signals and has its collector circuit connected (when limiting) to operate an appropriate utilization circuit. In one embodiment, the limiting amplifier is applied as a common mode feedback amplifier in a telephone line feed circuit, and the limiter signal is used to limit large longitudinal signals on a customer line and to power down the line feed circuit in the event the limited signals persist beyond a certain interval.
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AT&T Bell Laboratories
AT&T Company
Phelan Charles Scott
Rubinson Gene Z.
Vaas R.
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