Semiconductor integrated device having reduced jitter and reduced current consumption

Abstract

A structure is provided for significantly reducing the current excessively consumed for generating a high-speed clock signal necessary for signal processing, and significantly improve the jitter characteristics of the high-speed clock signal. The structure includes a reference-clock signal generation circuit, a time-base processing circuit, a PLL circuit, and a high-speed signal processing circuit. A low-speed reference-clock signal generated by the reference-clock signal generation circuit is provided to the PLL circuit. The PLL circuit generates a high-speed clock signal by multiplying the reference-clock signal by a factor of N. The factor N is at least 100. To reduce a jitter of the high-speed clock signal generated by the PLL circuit, a natural angular frequency ωn and a damping factor ζ that relate to the response characteristics of the system of the PLL circuit are set to range from 3 kHz to 10 kHz, and 0.01 or less, respectively.