To provide an oscillator capable of acquiring an oscillation output of high frequency stability in the oscillator including a crystal oscillator (OCXO) for detecting the ambient temperature of a quartz resonator, controlling a heating unit based on the detection results and keeping a constant ambient temperature.
When the oscillation outputs of first and second quartz resonators 10 and 20 are f1 and f2, and the oscillation frequencies of the oscillation outputs at a reference temperature are f1r are f2r, a frequency difference detection unit 3 operates {(f2-f1)/f1}-{(f2r-f1r)/f1r}. A difference value between the operation value and an ambient temperature set value of the quartz resonators 10 and 20 is then integrated, and a value obtained based on the integration value is employed as a frequency correction value for correcting a frequency set value to be inputted to a body circuit 200 including a PLL.
FURUHATA TSUKASA
SATO SHINICHI
JPH0468903A | 1992-03-04 | |||
JP2012170050A | 2012-09-06 | |||
JP2007251366A | 2007-09-27 |
US7378916B2 | 2008-05-27 | |||
US4079280A | 1978-03-14 |
Nobuaki Takizawa