Patent ID: 8659364
Filing Date: 2014-02-25
Classification: H03L

Abstract:
1. An oscillator device for correcting a setting signal for setting an output frequency based on a detection result of an ambient temperature, comprising: a first crystal unit having a crystal element and a first electrode; a second crystal unit having a crystal element and a second electrode; first and second oscillation circuits connected to the first and second crystal units, respectively; a frequency difference detection unit that obtains a value corresponding to a difference value between a value corresponding to a difference between f1 and f1r and a value corresponding to a difference between f2 and f2r, where f1 denotes an oscillation frequency of the first oscillation circuit, f1r denotes an oscillation frequency of the first oscillation circuit at a reference temperature, f2 denotes an oscillation frequency of the second oscillation circuit, and f1r denotes an oscillation frequency of the second oscillation circuit at a reference temperature; a first correction value acquisition unit that obtains a first correction value based on a first approximation formula expressing a relationship between a value corresponding to the difference value detected by the frequency difference detection unit, a value corresponding to the difference value, and a frequency correction value of the oscillation frequency f1 of the first oscillation circuit caused by a fact that an ambient temperature is different from the reference temperature; a second correction value acquisition unit that obtains a second correction value based on a second approximation formula expressing a relationship between the value corresponding to the difference value, a group of values corresponding to the difference values arranged with a predetermined interval, and correction residual errors obtained in advance for each of the values corresponding to the detection values belonging to the group, where the correction residual error refers to a difference between the first correction value defined in the first approximation formula and the frequency correction value actually measured in advance; and a first adder unit that obtains the frequency correction value by adding the first and second correction values, wherein an output of the oscillator device is generated by using an output of the first oscillation circuit, and the setting signal is corrected based on the frequency correction value obtained by the first adder unit.