Transmitter with self-triggered transition equalizer
AssigneeRambus Inc.
InventorYikui Jen Dong
Life of this patent
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Abstract
A transmitting device includes an output node, at least one driver circuit and transition equalization circuitry. The driver circuit drives an output data signal including a data transition onto the output node. The output of the transition equalization circuitry is coupled to the output node. The transition equalization circuitry begins to drive the output node at the data transition and ends driving of the output node a pre-determined delay after beginning to drive the output node. The transition equalization circuitry drives the output node by injecting current onto the output node if the data transition is a positive transition, and sinking current from the output node if the data transition is a negative transition.
Claims17
A transmitting device, comprising:
- an output node;
- at least one driver circuit to drive an output data signal onto the output node, the output data signal having a plurality of data transitions;
- and
- transition equalization circuitry having an output coupled to the output node, the transition equalization circuitry driving the output node with a drive strength that varies depending on a magnitude of change of digital data in the plurality of data transitions,
- wherein the transition equalization circuitry drives the output node by injecting current onto the output node responsive to a first data transition in the plurality of data transitions being a positive transition, and sinking current from the output node responsive to a second data transition in the plurality of data transitions being a negative transition.
A method of operation in a transmitting device, comprising:
- driving, with a line driver, an output data signal onto an output node, the output data signal having a plurality of data transitions;
- and
- driving, with a transition equalizer circuit, the output node with a drive strength that varies depending on a magnitude of change of digital data in the plurality of data transitions,
- wherein the drive strength varies by adjusting an amount of current injected into or sunk from the output node based on the magnitude of change of the digital data.
A non-transitory computer readable storage medium storing a representation of a transmitting device, the transmitting device comprising:
- at least one driver circuit to drive an output data signal onto an output node, the output data signal having a plurality of data transitions;
- and
- transition equalization circuitry having an output coupled to the output node, the transition equalization circuitry driving the output node with a drive strength that varies depending on a magnitude of change of digital data in the plurality of data transitions,
- wherein the transition equalization circuitry drives the output node by injecting current onto the output node responsive to a first data transition in the plurality of data transitions being a positive transition, and sinking current from the output node responsive to a second data transition in the plurality of data transitions being a negative transition.
Dependencies are inferred from the claim text.