A 20Gb/s adaptive duobinary transceiver

A 20Gb/s adaptive duobinary transceiver has been realized in 90-nm CMOS technology. An adaptive transmitter is realized without a feedback channel. For the channels with different lengths, the tap coefficient of the transmitter is digitally adjusted to compensate the channel loss. It achieves a data rate of 20-Gb/s with a BER less than 10⁻¹² over 16cm-FR4 board. The transmitter and receiver consume 81mW and 38mW from a 1.5V supply, respectively. For a 20-Gb/s PRBS of 2⁷-1, the maximum length of FR4 channel 16cm is achieved. The measured peak-to-peak jitter of the recovered data is 13.78ps.