Oscillator circuit, semiconductor device and semiconductor memory device provided with the oscillator circuit, and control method of the oscillator circuit
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United States of America Patent
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Oct 26, 2004
Grant Date -
Jul 10, 2003
app pub date -
Oct 7, 2002
filing date -
Jan 10, 2002
priority date (Note) -
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Abstract
The present invention is made to resolve problems of the above described prior art. Prime object of the present invention is to provide an oscillator circuit capable of outputting oscillation signal with stable oscillation frequency, a semiconductor device and a semiconductor memory device provided with the oscillator circuit, and control method of the oscillator circuit. For achieving the prime object, there are taken the following countermeasures at the time of initiating oscillation where the inventive oscillator circuit can control to operate/stop oscillation. That is, the countermeasures to be taken are: (1) oscillation operation is stopped or an output of an oscillation signal is not permitted while transient oscillation frequency is unstable; or (2) a period that transient oscillation frequency is unstable is shortened.
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