Active solid-state devices (e.g. – transistors – solid-state diode – Bipolar transistor structure – Plural non-isolated transistor structures in same structure
Patent
1992-12-04
1994-02-08
Carroll, J.
Active solid-state devices (e.g., transistors, solid-state diode
Bipolar transistor structure
Plural non-isolated transistor structures in same structure
257146, 257154, 257162, 257173, 257577, 257587, H01L 2990, H01L 2974
Patent
active
052851001
ABSTRACT:
A semiconductor switching device that is suitable for use as a remote isolation device (RID) in telephone networks. The semiconductor switching device is a two-terminal voltage sensitive device that switches from an open-circuit condition to a short-circuit condition at a fixed breakover voltage, appears as an open-circuit below the breakover voltage, and appears as a short-circuit above the breakover voltage. When semiconductor switching devices are installed in a telephone network, they are held in their short-circuit condition by the network voltage supply and do not affect the normal operation of the network but will switch to their open-circuit condition if the network voltage supply is reduced to below the breakover voltage, and therefore, parts of the network may be isolated from each other by reducing the voltage supply. Isolation of the parts of the network from each other facilitates testing for maintenance purposes.
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"Telecommunications Protection Circuits-Protection Design Guide", Texas Instruments Ltd., Bedford, England 1987.
Baumann Russell E.
Carroll J.
Donaldson Richard L.
Grossman Rene E.
Texas Instruments Incorporated
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