Method of generating a clock, a clock generation device, and electronic apparatuses having a clock generation device

摘要

In generating a frequency-modulated clock, a first frequency modulation (FM) signal having frequency fm1 is frequency-modulated by a second FM signal having a second frequency fm2, generating a clock modulation signal fm0. The clock generation signal fm0 is used to frequency-modulate the system clock CLK by the clock modulation signal fm0. Thus, the spectrum of the clock is doubly dispersed by the first and the second FM frequencies. As a result, peak levels at the fundamental and higher harmonic frequencies are reduced as compared with conventional clock generation device.