A Low-Power Programmable DLL-Based Clock Generator With Wide-Range Antiharmonic Lock

Abstract

A delay-locked-loop (DLL)-based clock generator for dynamic frequency scaling has been developed in a 0.13-mu m CMOS technology. The proposed clock generator can generate a wide range of the multiplied clock signals ranging from 125 MHz to 2 GHz. In addition, owing to the proposed antiharmonic-lock block, the clock generator can change the frequency dynamically in one cycle time of the reference clock. The proposed DLL-based clock generator occupies 0.019 mm(2) and consumes 21 mW at 2 GHz. The ratio of power consumption to frequency of the proposed clock generator is smaller than those of conventional ones.