Design of Phase Frequency Detector and Charge Pump for Low Voltage High Frequency PLL

Abstract

A simple new phase frequency detector and integrated Dickson Charge pump design with charge transfer switches (CTS's) are presented in this paper. The proposed Phase-Frequency Detector (PFD) and Charge-Pump are useful for low voltage, high frequency Phase-Looked-loops (PLL). This brief analyzes the blind zone in latch-based PFDs and proposes a technique that removes the blind zone caused by the precharge time of the internal nodes. With the proposed technique, the PFD achieves a small dead zone. The experimental results shows that the proposed PFD has minimal dead zone compared with the conventional PFD and CTS based Dickson charge pump is the best structure for integration. The PFD and Charge Pump are designed and simulated on Tanner 13.0V tool and has been simulated in a 0.18μm CMOS technology.