Transient Signal Detector with Temporal Hysteresis

National Semiconductor Corporation (1999) Transient Signal Detector with Temporal Hysteresis. .

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A subscriber line interface circuit which includes a transient signal detector with temporal hysteresis. During steady state operation, the drive current for the subscriber loop allows the loop to respond to changes in loop conditions according to a steady state time constant of the loop filter. Upon detection of a line voltage transient which exceeds a predetermined threshold in either a positive or negative direction, the filter time constant is significantly reduced (e.g., 100:1) and held at such reduced value following the initial transient and for a predetermined time period after the line voltage has fallen back below such predetermined threshold. This allows the transient conditions to be fully compensated prior to resetting the filter time constant back from the lower transient value to the higher steady state value.

Item Type:Patents
Additional Information:
Application Number US 09/139,011

Publication Number US5,973,516

Inventor: Duncan Bremner, Reed, Ray Allen.
Glasgow Author(s) Enlighten ID:Bremner, Dr Duncan
Authors: Bremner, D., and Reed, R. A.
College/School:College of Science and Engineering > School of Engineering

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