Patent ID: 8612794
Filing Date: 2013-12-17
Classification: H03K,H03L

Abstract:
1. A clock signal generating device in which a target frequency is set, comprising: a clock signal generating unit on which a voltage is successively impressed, and which successively generates a clock signal having a frequency corresponding to the successively impressed voltage; a first control unit that compares the target frequency and the frequency of the clock signal generated by the clock signal generating unit and, based on a result of the comparison, controls the voltage impressed on the clock signal generating unit so that the frequency of the clock signal becomes the target frequency; and a second control unit that, when the target frequency changes, performs control in place of the first control unit to successively change the voltage impressed on the clock signal generating unit by a preset change value and a preset interval within a preset time to cause the frequency of the clock signal to approach the target frequency; wherein the preset change value is constant and independent of the frequency of the clock signal generated by the clock signal generating unit.