DLL circuit and method of controlling the same
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United States of America Patent
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Jul 17, 2012
Grant Date -
Jun 23, 2011
app pub date -
Mar 2, 2011
filing date -
Nov 14, 2006
priority date (Note) -
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Abstract
A DLL circuit includes a clock selection control unit configured to generate a clock selection signal on the basis of a phase difference between a reference clock and a feedback clock and, after the clock selection signal is generated, to generate an initialization signal. A delay control unit, when the initialization signal is enabled, transfers an initial voltage to be generated by dividing an external power supply voltage to a delay unit as a control voltage, and controls a delay operation of a delay reference clock to be selected on the basis of the clock selection signal.
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