Patent ID: 7206339

Claim:
A wander generator for generating a clock signal having wander which satisfies a desired time deviation characteristic, comprising: center frequency information setting means for setting data for determining a center frequency of the clock signal; characteristic information setting means for setting characteristic information of the desired time deviation characteristic; a fluctuating signal sequence generator unit for generating a fluctuating signal sequence having a power spectrum density distribution characteristic of frequency fluctuations corresponding to the desired time deviation characteristic based on the characteristic information set by said characteristic information setting means; an adder for adding the data set by said center frequency information setting means to the fluctuating signal sequence output from said fluctuating signal sequence generator unit; a direct digital synthesizer for outputting a frequency signal corresponding to an output of said adder; and a clock signal output circuit for waveform shaping an output signal of said direct digital synthesizer to output a clock signal; wherein said fluctuating signal sequence generator unit comprises: noise generating means for generating a white noise signal based on a pseudo random signal; impulse response processing means for calculating an impulse response of a transfer function for approximating a power spectrum of the white noise signal output from said noise generating means to the power spectrum density distribution characteristic of the frequency fluctuations based on the characteristic information set by said characteristic information setting means; and convolution processing means for convoluting a result of the calculation by said impulse response processing means with the white noise signal output from the noise generating means to generate the fluctuating signal sequence having the power spectrum density distribution characteristic of the frequency fluctuations.