A low power programmable PRBS generator and a clock multiplier unit for 10 Gbps serdes applications

This paper presents the design of a low power programmable PRBS generator and a low noise clock multiplier unit (CMU) for 10 Gbps serdes applications. The PRBS generator is capable of producing 2⁷-1, 2¹⁰-1, 2¹⁵-1, 2²³-1, and 2³¹-1 b test pattern according to ITU-T recommendations. High speed and low power operations of the PRBS generator are achieved by 16 paths parallel feedback techniques. The measured jitter of the CMU is only 3.56 ps_rms, and the data jitter at the PRBS output is mainly determined by the CMU. Implemented in a 0.18 mum CMOS process, the power dissipation for PRBS generator is only 10.8 mW, and the CMU consumes about 87mW