A Low Mismatch Current Steering Charge Pump for High-Speed PLL

Abstract

This paper presents the design of a charge pump based on the current steering and positive feedback topology to support application in high-speed PLLs. The primary objective of the design is to counter current mismatch in charging and discharging currents as well as maintain fast operation with the help of positive feedback assisted current steering topology. This charge pump is designed in UMC 65nm CMOS technology and its functionality, characteristics and amount of current mismatch are verified across voltage and temperature variations. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.