| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a clock generation circuit capable of detecting a frequency variation due to the aging of an oscillator working as a clock source without measuring a frequency at periodical maintenance. <P>SOLUTION: This circuit comprises an acting clock generation circuit 100 for generating a clock signal corresponding to an OCVCXO102 output to be controlled by the control voltage and a standby clock generation circuit 200 for generating a clock signal according to the OCVCXO output to be controlled by the control voltage determined in a way that synchronization with the acting clock generation circuit 100 takes place through a reference signal "REFn" generated by the OCVCXO102 output. This circuit monitors a control voltage value to detect a frequency variation in the OCVCXO102. <P>COPYRIGHT: (C)2007,JPO&INPIT |
