Session 22-1

Multiphase-Output Level Shift System used in Multiphase
PLL for Low Power Application

 

Abstract

Low-power design is essential for mobile application. For a PLL with multiphase outputs, level shifter consumes much power; hence, we have devised a new architecture called a multiphase-output level shift system cutting off short current perfectly. Moreover, we have connected between the adjacent phases of the system with a resistor to improve phase accuracy. These techniques make power consumption 1/15 of the conventional level shifter. The PLL consumes 0.96mA@123MHz and accomplishes 63-phase accuracy of 0.5LSB.