Ultra-High-Speed CMOS Interface Technology

Enhancing the performance of the broadband Internet and the performance of computer and storage systems requires high-bandwidth networks to interconnect these systems. Fujitsu has already marketed high-speed network interface products such as the 10 G Ethernet and has recently developed a CMOS interface that accommodates high-speed data transfer at 6.4 Gb/s per signal line to increase network bandwidth. For this interface, we have developed a multi-tap pre-emphasis function for the transmitter and an adaptive equalizer for the receiver that can compensate for a highfrequency transmission loss of 20 dB or more in the backplane of devices and in cables that interconnect cabinets. When this CMOS interface is mounted on a system-on-a-chip (SoC) as a multi-channel interface, the system bandwidth can be upgraded significantly. This paper describes an ultra-high-speed CMOS interface that was manufactured experimentally using Fujitsu’s 0.11 μm CMOS process.