Digital signal transmitting circuit for telephone network
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United States of America Patent
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-
Feb 14, 1989
Grant Date -
N/A
app pub date -
Nov 13, 1987
filing date -
Nov 14, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit is disclosed for the transmission of digital signals on a bifilary line, especially a telephone line. The circuit disclosed is a so-called S interface circuit which has to produce digital signals within certain set limits. The proposed circuit uses four differential amplifiers, each controlling an output transistor (N-channel MOS transistors and P-channel MOS transistors). The amplifiers receive feedback to maintain the overvoltages within acceptable limits. The invention applies especially to the setting up of integrated service digital telephone networks.
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