Optimal modulation waveform generation apparatus and method for reducing clock noise, the optimal modulation clock noise reducing device for modulating the clock frequency by the waveform, the spectrum analyzer and the optimum modulation waveform computer readable which stores the computer program and the computer program for calculating the Na storage medium

摘要

PROBLEM TO BE SOLVED: To provide an optimum modulation waveform generating apparatus and method for reducing clock noise, a clock noise reduction apparatus for modulating a clock frequency by an optimum modulation waveform, a spectrum analysis apparatus, a computer program for calculating an optimum modulation waveform, and a computer-readable storage medium with the computer program stored, wherein the optimum modulation waveform can easily be obtained through calculation.;SOLUTION: A formula for calculating the optimum modulation waveform is obtained as a solution of a differential equation obtained on the basis of a derivative of a frequency change in a clock signal with respect to a time and of a maximum value of the sum of impulse responses at each period of a modulation wave and is a formula of modulating the clock signal so that levels of harmonics are almost made flat.;COPYRIGHT: (C)2006,JPO&NCIPI