A high performance NMOS-switch high swing cascode charge pump for phase-locked loops

In this work, we present a NMOS-switch high-swing cascode charge pump. The proposed design utilizes high-swing cascode current mirror to improve output current matching and a pull-up/pull-down mechanism to remedy the slow-node issue of a classic NMOS-switch current steering charge pump. The proposed NMOS-switch high-swing cascode charge pump has been designed using the IBM 0.13μm CMOS technology. Simulation results show that the proposed charge pump design features much improved output current matching and also eliminates the slow-node problem when compared to original approach.