Patent ID: 8729978
Filing Date: 2014-05-20
Classification: H03L

Abstract:
1. A quartz-crystal controlled oscillator comprising: an oscillation circuit for an oscillator output connected to a quartz-crystal oscillator; a heating unit keeping an atmosphere temperature at which the quartz-crystal oscillator is placed at a constant temperature; a first quartz-crystal oscillator structured by providing first electrodes on a first quartz-crystal piece; a second quartz-crystal oscillator structured by providing second electrodes on a second quartz-crystal piece; a first oscillation circuit and a second oscillation circuit connected to the first quartz-crystal oscillator and the second quartz-crystal oscillator, respectively; a frequency difference detecting unit determining, wherein when an oscillation frequency of the first oscillation circuit is set to f an adding section obtaining a partial difference between a temperature set value of the atmosphere temperature at which the first quartz-crystal oscillator and the second quartz-crystal oscillator are placed and the temperature detection value; and a circuit section controlling an electric power supplied to the heating unit based on the partial difference obtained in the adding section.