Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Patent
1996-08-26
1998-06-02
Hudspeth, David R.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
326 21, 326 83, 327309, H03K 1716
Patent
active
057606013
ABSTRACT:
A source terminated transmission line driver circuit with precise impedance matching capability and particularly suited for the output drivers of integrated circuit devices. The output transistors are operated in a current source mode using a common reference current, transistor dimension scaling, and current mirrors. The magnitude of the current provided by the output transistors is established to match the boundary conditions of the transmission line at turn-on and inherently matches the impedance characteristics upon the return of the reflected wave through conduction changes in the output transistors responsive to the transmission line voltage. The driver circuit transmits data signals over single or bus lines with minimum ringing.
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Hudspeth David R.
International Business Machines - Corporation
Salys Casimer K.
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