Regenerative clamp for multi-drop busses

Details Regenerative clamp for multi-drop busses Regenerative clamp for multi-drop busses

1997-09-17

1999-09-07

Chin, Stephen

Pulse or digital communications

Cable systems and components

375377, 326 30, 326 86, 327309, 327310, H04B 300, H04L 2300, H03K 1716, H03K 508

Patent

active

059498250

ABSTRACT:
Reflections on bus stubs are reduced by sensing when transition occurs on the bus. When a transition is detected, an impedance matched clamp device is activated that clamps the signal to the new (post-transition) voltage for a short period of time. This clamping action reduces the energy in the reflected wave which reduces the ability of the reflected wave to change the voltage on the bus. A receiver detects when a transition occurs on the bus. The output of the receiver is coupled to a delay device. Logic gates combine the output of the delay device with the output of the receiver to produce two pulsed outputs. One pulsed output is pulsed in response to a low-to-high transition on the bus, the other pulsed output is pulsed in response to a high-to-low transition on the bus. These pulsed outputs control the clamp devices so that the clamp devices are only turned on for a short period of time.

REFERENCES:
patent: 5485107 (1996-01-01), Lacey et al.
patent: 5514979 (1996-05-01), Collins et al.
patent: 5546016 (1996-08-01), Allen
patent: 5585740 (1996-12-01), Tipon

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