| 摘要 |
<P>PROBLEM TO BE SOLVED: To highly accurately perform temperature compensation of an output frequency in an oscillation device which corrects the output frequency on the basis of a detection result of an environmental temperature. <P>SOLUTION: First and second crystal oscillators are constituted of a common crystal piece, and when oscillation output signals of first and second oscillation circuits respectively connected to the crystal oscillators are defined as f1 and f2 and oscillation frequencies of the first and second oscillation circuits at a reference temperature are defined as f1r and f2r respectively, a frequency difference which is a difference between a value corresponding to a difference between f1 and f1r and a value corresponding to a difference between f2 and f2r is handled as a temperature at the time. Then, on the basis of the frequency difference, a frequency correction value is obtained by polynomial approximation. <P>COPYRIGHT: (C)2012,JPO&INPIT |
