Semiconductor device and voltage-controlled oscillation circuit
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United States of America Patent
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Jan 1, 2008
Grant Date -
Jun 22, 2006
app pub date -
Feb 16, 2006
filing date -
Oct 17, 2003
priority date (Note) -
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Abstract
A voltage-controlled oscillation circuit (15) includes a plurality of independent ring oscillation circuits different in the number of stages; and a selector (22) selectively outputting as a feedback clock signal (FB) an output of one of the ring oscillation circuits, so that any of the outputs of the independent ring oscillation circuits is always outputted as the feedback clock signal, which makes it possible to output the feedback clock signal keeping a proper duty ratio even when the operating speed is high, allowing arbitrary adjustment of the delay time before an input signal (DLLI) is outputted.
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