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Design and Applications of Delay Locked Loop

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Symmetrical relation between pulse/pause is unmatched<br />

when:<br />

signal passes through a long series <strong>of</strong> buffers,<br />

unbalance <strong>of</strong> N <strong>and</strong> P MOS transistors,<br />

technology variations,<br />

temperature or supply voltage have change ...<br />

PWCL scheme<br />

Waveform at<br />

PWCL<br />

obtained by<br />

Spice<br />

simulation

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