Semiconductor device capable of accurately producing internal multi-phase clock signal
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United States of America Patent
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Feb 22, 2005
Grant Date -
Jun 3, 2004
app pub date -
May 22, 2003
filing date -
Nov 28, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An operation control signal for an oscillator producing an internal clock signal phase-locked with a basic clock signal is applied to a second internal clock generating circuit. In the second internal clock generating circuit, with reference to the applied operation control signal, a control signal adjusting a phase and/or frequency difference between a synchronization target signal and a second internal clock signal is produced to adjust a phase and/or frequency of the second internal clock signal. A plurality of internal clock signals different in phase and/or frequency can be generated accurately and stably.
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