Patent ID: 9100023
Filing Date: 2015-08-04
Classification: H03L

Abstract:
1. A crystal oscillator, comprising: an oscillation circuit, being connected to a crystal unit for generating an oscillator output; first and second oscillation circuits, being connected to first and second temperature detection crystal units, respectively; a heating portion for constantly maintaining an ambient temperature of each of the crystal units; a frequency difference detection portion that obtains, as a temperature detection value, a digital value corresponding to a difference value between a value corresponding to a difference between frequencies f an accumulator that accumulates the temperature detection value as the digital value obtained from the frequency difference detection portion depending on a designated accumulation number; a rounding processing portion that performs rounding for the temperature detection value accumulated in the accumulator depending on a rounding factor designated independently from designation of the accumulation number; and a heating control portion that controls power supplied to a heating portion based on the temperature detection value subjected to the rounding in the rounding processing portion.