A 4-channel 3.125Gb/s/ch CMOS transceiver with 30dB equalization

A 4-channel 3.125Gb/s/ch CMOS transceiver has been developed. The receiver includes a second-order derivative analog equalizer to compensate the frequency-dependent attenuation. Equalization can be performed adaptively through monitoring the residual inter-symbol-interference. To talk with a system without receiver equalization, a multiple-tap filter for pre-emphasis is implemented in transmitter. Either analog filter or pre-emphasis is capable of 30dB equalization. Transceiver design is compatible with XAUI and 10GBASE-CX4, but extending the reach over copper cabling. Evaluation shows lower than 10^-12 BER has been achieved with 30-meter AWG 24 cable.