Patent ID: 6429678
Filing Date: 2002-08-06
Classification: H04L

Abstract:
A buffered active terminating circuit comprising:a pullup clamping transistor for sourcing an upper clamping current to a transmission node in response to an upper gate node; an upper coupling capacitor for coupling a voltage transition on the transmission node to an upper node; an upper buffer, having the upper node as an input, for driving an upper enabling voltage onto the upper gate node in response to a high-going transition on the transmission node, the upper enabling voltage enabling the pullup clamping transistor to source the upper clamping current; a pulldown clamping transistor for sinking a lower clamping current from a transmission node in response to a lower gate node; a lower coupling capacitor for coupling the voltage transition on the transmission node to a lower node; and a lower buffer, having the lower node as an input, for driving a lower enabling voltage onto the lower gate node in response to a low-going transition on the transmission node, the lower enabling voltage enabling the pulldown clamping transistor to sink the lower clamping current, whereby clamping currents are applied to the transmission node.