A 8GHz Phase interpolator based Charge pump with 0.23% Phase Error

This paper proposes a novel approach to mitigate the effects of current mismatches in CP-based PIs by using a reduced current mismatch charge pump (RCMCP) topology. RCMCP uses a current mirror-based architecture that can significantly reduce the current mismatch of PMOS and NMOS while maintaining the characteristics of existing CPs. The proposed RCMCP-based PI was designed and simulated using 65nm CMOS technology, and its performance was evaluated using simulations. The simulation results show that the proposed RCMCP-based PI has better power efficiency compared to the existing PI with a target resolution than the target resolution. The proposed PI operates at 8 GHz with a target resolution of 3.9 ps and a phase error of 0.23%.