| 摘要 |
PROBLEM TO BE SOLVED: To increase the noise removing capability of a piezoelectric oscillator which compensates temperature by using a MOS varactor to improve phase noise of the piezoelectric oscillator which becomes worse at a low/high temperature end. SOLUTION: This temperature compensation piezoelectric oscillator 100 is equipped with an oscillation circuit 12 and a frequency temperature compensating circuit. The frequency temperature compensating circuit comprises a temperature detection portion 3 whose parameter varies with ambient temperature, a temperature compensating voltage generation portion 2 which generates a voltage on the basis of the varying parameter, MOS varactors MH10 and ML11 which vary in capacity on the basis of the potential difference between temperature compensating voltages (VH, VL) generated by the temperature compensating voltage generating circuit 2 and the reference voltage (Vref), a MOS varactors (noise removing means) 4 and 5 which remove noise from the temperature compensating voltages, DC stopping capacitors 7 and 9, and fixed resistors 6 and 8. COPYRIGHT: (C)2006,JPO&NCIPI
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