An 800GbE PAM-4 PHY Transceiver for 42 dB Copper and Direct-Drive Optical Applications in 7 nm

This work presents a low power DSP-based singlechip 800GbE PAM-4 PHY transceiver in 7nm process capable of driving eight lanes of up to 112-Gb/s. It supports both electrical and optical links with monolithic integrated laser driver enabling direct-drive PAM-4 output capability for EML and silicon photonics. The transceiver supports 42dB IL channel at Nyquist with pre-FEC BER<3E-8. The per-lane analog power efficiency is 2.78pJ/b for low-swing drive mode and 4.9pJ/b for direct-drive mode.