A wide-range duty-independent all-digital multiphase clock generator

Abstract

A wide-range, input-duty-independent, all-digital, multiphase clock generator is proposed. By using a supply noise filtering block power supply noise effect is reduced. Furthermore, because the proposed clock generator consists of all-digital logic gates, it can be easily migrated to a different process within a short time. The circuit has been fabricated with a 0.18 mum 1P4M CMOS technology and operates over a frequency range from 300 MHz to 1.5 GHz within 5 cycles of reference clock.