A 1/4-RATE LINEAR PHASE DETECTOR FOR HIGH SPEED PLL-BASED CLOCK AND DATA RECOVERY CIRCUIT

摘要

A novel 1/4-rate clock phase detector (PD) structure for phase locked loop (PLL)-based clock and data recovery (CDR) is proposed. In this topology, the retimed data is generated within the circuit and no extra circuit is required. Furthermore, the error and reference signals are independent of delay time through gates and thus, no extra replica circuit is needed to compensate such delay. Designed in a 0.18-μm CMOS technology, the proposed 10Gb/s PD consumes 30 mA from a 1.8 V supply, resulting in a lower power consumption for high-speed applications compared to conventional topologies.