Patent ID: 7595701
Filing Date: 2009-09-29
Classification: H03B

Abstract:
1. A constant temperature oven type crystal oscillator, comprising: a detection circuit for detecting a difference between a temperature signal outputted from a temperature detection device for sensing temperature inside the crystal oscillator and a predetermined target temperature input signal corresponding to a target temperature and generating a first difference signal; a temperature control circuit for generating an addition signal in which the influence on the temperature fluctuations of the first difference signal is suppressed, by adding the first difference signal and an extraction signal obtained by integrating and inverting the first difference signal due to temperature fluctuations so as to extract a change of the first difference signal and controlling an amount of generated heat of a heating source device for controlling heat generation, provided in the oscillator, on the basis of the addition signal; and a frequency compensation circuit for detecting a difference between a frequency compensation signal for compensating for a frequency of a crystal oscillator device and the extraction signal and making a second difference signal of it and stabilizing a vibration frequency of the crystal oscillator device on the basis of the second difference signal.