A 5 Gbps CMOS frequency tolerant multi phase clock recovery circuit

A clock and data recovery (CDR) circuit using multi phase gated VCO (MGVCO) technique for multi-channel high-speed serial interface was developed. This architecture can realize quick data acquisition and plesiochronous clocking capability. A 5 Gbps 32-channel test chip, designed in 0.18 /spl mu/m CMOS technology, achieved BER of <10/sup -12/ in 5 Gbps CDR operation with /spl plusmn/3% frequency tolerance for random incoming data of 2/sup 7/-1.