Method and circuit for actively controlling the transition imped

Details Method and circuit for actively controlling the transition imped Method and circuit for actively controlling the transition imped

1993-10-04

1996-06-04

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

326 21, 333 22R, H03K 1716

Patent

active

055237045

ABSTRACT:
A method and circuit for actively controlling the transition resistance of a multiplex communication signal line having a known termination resistance and characterized by digital signals defined by dominant and recessive states between a voltage source and a ground potential. The digital signal is sensed at the node when it moves through a transition band defined between the dominant and recessive states. The effective terminator resistance at the node along the signal line is reduced only responsive to the digital signal level being within the transition band, whereby the transition time for the signal to travel through the transition band is reduced by reducing the effective resistance and therefore the effective RC time constant at the node.

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SAE Recommended Practice J1850 Class B Data Communication Network Interface May 11, 1993.

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