A 0.004-mm2 Portable Multiphase Clock Generator Tile for 1.2-GHz RISC Microprocessor.

Portable multiphase clock generators capable of adjusting its clock phase according to input clock frequencies have been developed both in a 0.18-µm and in a 0.13-jµm CMOS technologies. They consist of a full-digital CMOS circuit design that leads to a simple, robust, and portable IP. In addition, their open-loop architecture lead to no jitter accumulation and one-cycle lock characteristic that enables clock-on-demand circuit structures. The implemented low power clock generator tile in a 0.13-µm CMOS technology occupies only 0.004mm² and operates at variable input frequencies ranging from 625 MHz to 1.2 GHz within a ± 2% phase error having one-cycle lock time. [ABSTRACT FROM AUTHOR]