Charge compensation control circuit and method for use with output driver
AssigneeRambus Inc.
InventorsDonald C. Stark, Jun Kim, Kurt T. Knorpp, Michael Tak-Kei Ching, Natsuki Kushiyama
Life of this patent
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Abstract
An output driver has an output multiplexor and an output current driver. The output multiplexor receives a data signal and outputs a q-node signal. The output current driver receives the q-node signal and drives a bus based on the q-node signal. The output multiplexor processes the data signal in various ways to generate the q-node signal. The output current driver is responsive to current control bits to select a amount of output drive current. In addition, the output multiplexor is controlled such that the output impedance of the output current driver is maintained within a predetermined range.
Claims6
A charge compensation control circuit, comprising:
- a charge compensation circuit operative to supply an amount of charge to a supply voltage based on a charge compensation value;
- and
- a test charge compensation circuit operably coupled to the charge compensation circuit, wherein the test charge compensation circuit is operative to determine the charge compensation value by modeling charge consumption characteristics of a circuit using the supply voltage;
- wherein the test charge compensation circuit is configured to iterate through a plurality of intermediate charge compensation values before selecting the charge compensation value provided to the charge compensation circuit.
A method for controlling a charge compensation circuit, comprising:
- determining a charge compensation value using a charge compensation bit generator that includes a test charge compensation circuit, wherein the test charge compensation circuit models behavior of the charge compensation circuit;
- and
- providing the charge compensation value to the charge compensation circuit such that an amount of charge sourced by the charge compensation circuit is controlled;
- wherein the test charge compensation circuit is configured to iterate through a plurality of intermediate charge compensation values before selecting the charge compensation value provided to the charge compensation circuit.
Dependencies are inferred from the claim text.