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US 2010/0244916 A1Published application
Self-timed fine tuning control
AssigneeRound Rock Research, LLC
InventorKang Y. Kim
Life of this patent
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Abstract
A delay lock loop having improved timing control of input signals. Specifically, a fine delay block is provided having feedback loops therein such that the fine delay block is self tuning. The output of the fine delay block may be implemented to control a coarse delay block in a delay lock loop.
Claims3
A delay lock loop comprising:
- a fine delay block comprising:
- a plurality of fine shift registers configured to receive a first enable signal from a fine delay control and configured to produce a second enable signal;
- and
- a plurality of fine delay units configured to receive the second enable signal and produce a fine delay unit output comprising a shifted input signal, wherein each of the plurality of fine delay units is configured to shift a signal by a first time delay;
- and
- a coarse delay block comprising:
- a coarse delay shift register configured to be controlled by the fine delay block and produce a third enable signal;
- and
- a plurality of coarse delay units configured to receive the third enable signal and wherein each of the plurality of coarse delay units is configured to shift a signal by a second time delay, wherein the second time delay is greater than the first time delay, wherein the coarse delay block comprises an inverter, the inverter having a single input and being configured to control shifting a signal in the coarse delay block.
6 more elements
Dependencies are inferred from the claim text.